CN204442175U - A kind of power circuit and there is the electronic product of described power circuit - Google Patents
A kind of power circuit and there is the electronic product of described power circuit Download PDFInfo
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- CN204442175U CN204442175U CN201520131832.7U CN201520131832U CN204442175U CN 204442175 U CN204442175 U CN 204442175U CN 201520131832 U CN201520131832 U CN 201520131832U CN 204442175 U CN204442175 U CN 204442175U
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Abstract
The utility model discloses a kind of power circuit and there is the electronic product of described power circuit, for being the different two class electricity consumption load supplyings of starting current, comprise first via power conversion chip and the second road power conversion chip, when needing two class electric loading described in startup, described first via power conversion chip and the second road power conversion chip export the large supply power voltage needed for Equations of The Second Kind electric loading of starting current jointly, control Equations of The Second Kind electric loading first startup optimization, after Equations of The Second Kind electricity consumption load running is stable, described first via power conversion chip stops to Equations of The Second Kind electricity consumption load supplying, export the supply power voltage needed for first kind electric loading that starting current is little, control first kind electric loading at rear startup optimization.The phenomenon of the voltage instability that employing scheme can avoid larger load to cause because starting current is excessive when starting, enhances the stability of power circuit, then improves stability and the reliability of electronic product start operation.
Description
Technical field
The utility model belongs to power supply circuits technical field, specifically, and the electronic product relating to a kind of power circuit for improving electronic product power good when starting up and adopt described power circuit to design.
Background technology
In current a lot of electronic products, integrated the getting more and more by electric loading of its inner needs, and the supply power voltage needed for many electric loadings is not quite similar.In order to meet unequally loaded need for electricity, need in electronic product, design multiple power supplies conversion chip, as DC-DC_1, DC-DC_2 in Fig. 1, one road direct-current input power supplying VIN is converted to DC output power V1, V2 of the different amplitude of multichannel, such as, for different electricity consumption load supplyings, load LOAD1, LOAD2.
In the electronic product being built-in with multiple power supplies conversion chip, the use electric loading connected due to different power conversion chips is different, and as power conversion chip DC-DC_1 in Fig. 1 connects load LOAD1, power conversion chip DC-DC_2 connects load LOAD2.When exist in system one larger use electric loading time, be described for load LOAD2, in the moment of load LOAD2 electrifying startup, can produce a larger starting current, this starting current can cause the out-put supply V2 of power conversion chip DC-DC_2 to fluctuate.When the out-put supply V2 of described power conversion chip DC-DC_2 fluctuates comparatively large, during the voltage output range allowed beyond power conversion chip DC-DC_2, the direct-current input power supplying VIN of power conversion chip DC-DC_2 input side will be caused to change.Because direct-current input power supplying VIN is simultaneously as the power supply of an other road power conversion chip DC-DC_1, therefore, when there is fluctuation in direct-current input power supplying VIN, an other road power conversion chip DC-DC_1 changes the DC output power V1 exported and generation is fluctuated, thus affect its normal power supply to load LOAD1, load LOAD1 can be caused time serious normally to work, then have influence on the normal operation of whole system.
Summary of the invention
The purpose of this utility model be to provide a kind of for improving starting up time power good power circuit, to solve the problem of the supply power voltage instability that existing power supply circuit causes because starting current is excessive when heavy load starts.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of power circuit, for being the different two class electricity consumption load supplyings of starting current, comprise first via power conversion chip and the second road power conversion chip, when needing two class electric loading described in startup, described first via power conversion chip and the second road power conversion chip export the large supply power voltage needed for Equations of The Second Kind electric loading of starting current jointly, control Equations of The Second Kind electric loading first startup optimization, after Equations of The Second Kind electricity consumption load running is stable, described first via power conversion chip stops to Equations of The Second Kind electricity consumption load supplying, export the supply power voltage needed for first kind electric loading that starting current is little, control first kind electric loading at rear startup optimization.
Wherein, described first via power conversion chip and the second road power conversion chip receive same road input power; The supply power voltage that described first via power conversion chip regulates it to export according to the feedback voltage level that its feedback end receives, described feedback end connects the output of first via power conversion chip by the bleeder circuit that a resistance is adjustable, and described bleeder circuit regulates by changing the divider resistance being connected to described feedback end the magnitude of voltage transferring to described feedback end.
As a kind of preferred electrical architecture design of described bleeder circuit, the utility model is provided with two switch elements and three divider resistances in described bleeder circuit, wherein, between the output that second divider resistance is connected to first via power conversion chip and feedback end, the feedback end of described first via power conversion chip is leaded up to the switch ways of the first switch element and is connected the first divider resistance, and by the first divider resistance ground connection, the switch ways of second switch element of separately leading up to connects the 3rd divider resistance, and by the 3rd divider resistance ground connection; The control end of described first switch element receives the first enable signal, and the control end of second switch element receives the 3rd enable signal.
In order to ensure that the supply current exported by two-way power conversion chip can be transmitted exactly to two class electric loadings, when the supply power voltage needed for described first kind electric loading is less than the supply power voltage needed for Equations of The Second Kind electric loading, the output designing described first via power conversion chip connects the output of the second road power conversion chip by an anti-back biased diode; Described first via power conversion chip, when being Equations of The Second Kind electricity consumption load supplying jointly with the second road power conversion chip, configures the supply power voltage V1=V2+Va+V that described first via power conversion chip exports
d; Wherein, V2 is the supply power voltage that the second road power conversion chip exports; Va is the permission undulating value of the output voltage of the second road power conversion chip; V
dbe the conduction voltage drop of described anti-back biased diode, to ensure that two-way power conversion chip is when Equations of The Second Kind electric loading startup optimization, can be Equations of The Second Kind electricity consumption load supplying simultaneously.When described first via power conversion chip is first kind electricity consumption load supplying, supply power voltage V≤V2-Va+V that first via power conversion chip exports
d, to avoid the output voltage of the second road power conversion chip to cause clamped impact to the supply power voltage V that first via power conversion chip exports, then affect the normal operation of first kind electric loading.
In order to control in order the operating state of two-way power conversion chip, the utility model is also provided with the control circuit of a control described first via power conversion chip and the enable operation of the second road power conversion chip in described power circuit, described control circuit needs to generate the first enable signal during startup optimization in first kind electric loading, transferred to the Enable Pin of first via power conversion chip by switching diode, need during startup optimization, to generate the Enable Pin that the second enable signal transfers to the second road power conversion chip in Equations of The Second Kind electric loading; Described second enable signal Equations of The Second Kind electric loading from start to stable during in transfer to the Enable Pin of first via power conversion chip, control the enable operation of first via power conversion chip, export power supply to Equations of The Second Kind electric loading.
Further, described second enable signal transfers to the Enable Pin of first via power conversion chip under the gating of the first switching circuit controls, described control circuit Equations of The Second Kind electric loading from start to stable during in export effective 3rd enable signal, transfer to the control end of the first switching circuit, control the signal transmission pathway between Enable Pin that described first switching circuit is communicated with the second enable signal and first via power conversion chip.
As a kind of preferred electrical architecture design of described first switching circuit, the utility model is provided with a NPN type triode and a PMOS in described first switching circuit, second enable signal described in source electrode reception of described PMOS, drain electrode connects the Enable Pin of first via power conversion chip, the grid of described PMOS connects the source electrode of described PMOS by a configuration resistance, and be connected with the collector electrode of described NPN type triode, the grounded emitter of described NPN type triode, the 3rd enable signal described in base stage receives.
In order to control exactly the startup optimization of described first kind electric loading, the output of described first via power conversion chip connects first kind electric loading by second switch circuit, described second switch circuit receives the first enable signal that described control circuit exports, when described first enable signal is effective, being communicated with the current supply circuit between first via power conversion chip and first kind electric loading, is first kind electricity consumption load supplying.
As a kind of preferred electrical architecture design of described second switch circuit, the utility model is provided with another NPN type triode and another PMOS in described second switch circuit, the source electrode of another PMOS described connects the output of first via power conversion chip, drain electrode connects first kind electric loading, grid connects the source electrode of another PMOS described by another configuration resistance, and be connected with the collector electrode of another NPN type triode described, the grounded emitter of another NPN type triode described, the first enable signal described in base stage receives.
Based on above-mentioned power circuit, the utility model also proposed a kind of electronic product adopting described power circuit to design, be provided with for the power circuit for the different two class electricity consumption load supplyings of starting current in described electronic product, described power circuit comprises first via power conversion chip and the second road power conversion chip, when needing two class electric loading described in startup, described first via power conversion chip and the second road power conversion chip export the large supply power voltage needed for Equations of The Second Kind electric loading of starting current jointly, control Equations of The Second Kind electric loading first startup optimization, after Equations of The Second Kind electricity consumption load running is stable, described first via power conversion chip stops to Equations of The Second Kind electricity consumption load supplying, export the supply power voltage needed for first kind electric loading that starting current is little, control first kind electric loading at rear startup optimization.
Compared with prior art, advantage of the present utility model with good effect is: the utility model passes through to control the startup optimization order of two different class electric loadings of starting current, and control two-way power conversion chip is such electricity consumption load supplying when the use electric loading startup optimization that starting current is large simultaneously, the load capacity of power circuit can be increased thus, prevent the starting current fluctuation because of load comparatively large and the voltage output range that causes the voltage fluctuation of the outlet side of power conversion chip to exceed power conversion chip allowing, then power circuit is avoided when heavy load starts, the phenomenon of the supply power voltage instability caused because starting current is excessive, improve the stability of power circuit and the reliability of load running.
After reading the detailed description of the utility model execution mode by reference to the accompanying drawings, other features of the present utility model and advantage will become clearly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of embodiment of existing power supply circuit;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the power circuit that the utility model proposes.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
The present embodiment is in order to solve existing power supply circuit when system boot because some is comparatively large and affect the problem of power supply output stability with electric loading starting current, propose a kind of brand-new method of supplying power to and circuit design, to improve the stability that when system boot starts, power supply exports.
First the design philosophy of the Power supply control method of the present embodiment is specifically addressed.
The Power supply control method of the present embodiment proposes mainly for the powerup issue of the different two class electric loadings of starting current when starting up.For two class electric loadings, the present embodiment design two-way power conversion chip is the electricity consumption load supplying described in two classes.Suppose that the starting current of first kind electric loading is less than the starting current of Equations of The Second Kind electric loading, when needing two class electric loading described in startup, the stability of power supply during in order to improve starting up, first the present embodiment controls two-way power conversion chip is the Equations of The Second Kind electricity consumption load supplying that starting current is large jointly, controls the first startup optimization of Equations of The Second Kind electric loading.The current fluctuation scope that can bear due to two-way power conversion chip is much larger than the current carrying capability of the outlet side of a road power conversion chip, therefore, even if the starting current fluctuation of Equations of The Second Kind electric loading is larger, its voltage fluctuation peak value caused by the outlet side of two-way power conversion chip also can not exceed the voltage output range that power conversion chip allows, thus can not the input power being connected to described power conversion chip be impacted, then improve the stability of power circuit.
After described Equations of The Second Kind electricity consumption load running is stable, the first via power conversion chip controlled in described two-way power 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 electric loading startup optimization.Because the starting current fluctuation of first kind electric loading is less, it can not exceed in the voltage fluctuation that the outlet side of first via power conversion chip causes the voltage output range that first via power conversion chip allows, therefore when the first kind is with electric loading startup optimization, also can not the input power connecting first via power conversion chip be impacted, just can ensure the stability of whole system power supply when load starting up thus.
In the present embodiment, described two-way power conversion chip can connect same road input power, by carrying out the conversion of voltage magnitude to described input power, to generate the supply power voltage needed for two class electric loadings, is two class electricity consumption load supplyings.
In the present embodiment, the described supply power voltage needed for two class electric loadings can be the same or different, and only can comprise one by electric loading, also can comprise the difference electric loading that multiple supply power voltage is identical in each class electric loading.When the supply power voltage needed for two described class electric loadings is different, when controlling Equations of The Second Kind with electric loading startup optimization, need the output voltage first regulating described first via power conversion chip according to the supply power voltage needed for Equations of The Second Kind electric loading, make the voltage exported by first via power conversion chip meet the power demands of Equations of The Second Kind electric loading.Then, after Equations of The Second Kind electricity consumption load running is stable, the output voltage of described first via power conversion chip is regulated according to the supply power voltage needed for first kind electric loading, make 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 power voltage needed for Equations of The Second Kind electric loading is only provided by the second road power conversion chip, keeps Equations of The Second Kind electricity consumption load continuous to run.Owing to being changed the voltage of output by the second road power conversion chip only for being Equations of The Second Kind electricity consumption load supplying, therefore configuration can be fixed according to the output voltage of the supply power voltage needed for Equations of The Second Kind electric loading to the second road power conversion chip in advance.
Based on above-mentioned design philosophy, the present embodiment proposes power circuit design as shown in Figure 2.
In Fig. 2, U1 is first via power conversion chip, U2 is the second road power conversion chip, described two-way power conversion chip U1, U2 receive same road direct-current input power supplying VIN by its input IN, electric capacity CIN1, CIN2 are used for carrying out filtering process to described direct-current input power supplying VIN, to improve the stability of the direct-current input power supplying VIN being input to two-way power conversion chip U1, U2.
The output OUT of first via power conversion chip U1 is connected the anode of an anti-back biased diode D2, the negative electrode of anti-back biased diode D2 is connected to the output OUT of the second road power conversion chip U2, the output OUT of described second road power conversion chip U2 connects Equations of The Second Kind electric loading LOAD2, for providing the supply power voltage V2 needed for it with electric loading LOAD2.In order to control the operating state of two-way power conversion chip U1, U2, the present embodiment generates three road enable signal EN1, EN2, EN3 by a control circuit, realizes the enable control to two-way power conversion chip U1, U2.In the present embodiment, described control circuit can adopt discrete device to build, and also can directly adopt the integrated chips such as MCU, CPU as controller to simplify circuit design.The present embodiment preferably adopts MCU to generate described enable signal EN1, EN2, EN3, and described enable signal EN1, EN2, EN3 can be the on-off model of high/low level.
The the first enable signal EN1 exported by MCU is transferred to the Enable Pin EN of first via power conversion chip U1 by switching diode D1, for when the needs control first kind is run with electric loading LOAD1, control the enable operation of first via power conversion chip U1.The the second enable signal EN2 exported by MCU is transferred to the Enable Pin EN of the second road power conversion chip U2, for when needs control Equations of The Second Kind runs with electric loading LOAD2, control the enable operation of the second road power conversion chip U2.In order to when Equations of The Second Kind is with electric loading LOAD2 startup optimization, two-way power conversion chip U1, U2 can be controlled and power for Equations of The Second Kind electric loading LOAD2 together.Described second enable signal EN2 is transferred to the first switching circuit by the present embodiment simultaneously, and the 3rd enable signal EN3 utilizing MCU to export control the first switching circuit Equations of The Second Kind electric loading LOAD2 from start to stable during in conducting, with the signal transmission pathway between the Enable Pin EN being communicated with the second enable signal EN2 and first via power conversion chip U1, then utilizing the second enable signal EN2 to control first via power conversion chip U1 is that Equations of The Second Kind electric loading LOAD2 powers when Equations of The Second Kind electric loading LOAD2 startup optimization.
As a kind of preferred design of the present embodiment, described first switching circuit can adopt a PMOS Q5 to coordinate a NPN type triode Q6 to be formed by connecting, as shown in Figure 2.The source electrode of described PMOS Q5 is connected MCU, receives the second enable signal EN2 that MCU exports, and connect the grid of PMOS Q5 by configuration resistance R4.The drain electrode of described PMOS Q5 is connected to the Enable Pin EN of first via power conversion chip U1, grid connects the collector electrode of described NPN type triode Q6.The grounded emitter of described NPN type triode Q6, base stage receives the 3rd enable signal EN3 that MCU exports.
Supply power voltage needed for two class electric loading LOAD1, LOAD2 may be different, in the present embodiment, supply power voltage V1 needed for described first kind electric loading LOAD1 is less than the supply power voltage V2 needed for Equations of The Second Kind electric loading LOAD2, therefore in order to meet the power demands of two class electric loading LOAD1, LOAD2, the voltage to first via power conversion chip U1 exports is needed to regulate.For this reason, the present embodiment connects the adjustable bleeder circuit of a resistance at the feedback end FB of first via power conversion chip U1, regulates the output voltage of power conversion chip U1 by changing the divider resistance being connected to described feedback end FB.
As a kind of preferred electrical architecture design of described bleeder circuit, the present embodiment is provided with two switch elements Q1, Q2 and three divider resistances R1, R2, R5 in described bleeder circuit, as shown in Figure 2.Wherein, the components and parts that described two switch elements Q1, Q2 can select NPN type triode, metal-oxide-semiconductor or controllable silicon etc. to have on-off action carry out circuit design, and the present embodiment is described for NPN type triode.The collector electrode of two NPN type triode Q1, Q2 is connected to respectively the feedback end FB of first via power conversion chip U1, and is connected to the output OUT of first via power conversion chip U1 by the second divider resistance R2.By NPN type triode Q1(first switch element) emitter by the first divider resistance R1 ground connection of series connection, the first enable signal EN1 described in the base stage of NPN type triode Q1 receives.By NPN type triode Q2(second switch element) emitter by the 3rd divider resistance R5 ground connection of series connection, the 3rd enable signal EN3 described in the base stage of NPN type triode Q2 receives.
When after system boot, input power VIN sets up, and transfers to the input IN of first via power conversion chip U1 and the second road power conversion chip U2 respectively, for two-way power conversion chip U1, U2 power.Utilize described input power VIN can power for MCU, MCU is started and enters steady operational status.After MCU stable operation, export invalid the first enable signal EN1(such as low level) and effective second enable signal EN2 and the 3rd enable signal EN3(such as high level).Now, because the second enable signal EN2 is high level, therefore the enable operation of the second road power conversion chip U2, be connected to the resistance of the feedback end FB of the second road power conversion chip U2 and divider resistance R7, R6 of output OUT by configuration, the supply power voltage V2 of output voltage needed for Equations of The Second Kind electric loading LOAD2 of the second road power conversion chip U2 can be controlled.Simultaneously, because the 3rd enable signal EN3 is high level, therefore NPN type triode saturation conduction, drag down the grid potential of PMOS Q5, control PMOS Q5 saturation conduction, make the second enable signal EN2 of high level transfer to the Enable Pin EN of first via power conversion chip U1, control the enable operation of first via power conversion chip U1.Now, due to the first enable signal EN1 be low level, the 3rd enable signal EN3 is high level, therefore triode Q1 ends, triode Q2 saturation conduction, namely the divider resistance being linked into the feedback end FB of first via power conversion chip U1 is R2 and R5, by reasonably configuring the resistance of divider resistance R2 and R5, make the supply power voltage V=V2+Va+V exported by first via power conversion chip U1
d; Wherein, V2 is the supply power voltage that the second road power conversion chip U2 exports; Va is the permission undulating value of the output voltage of the second road power conversion chip U2; V
dit is the conduction voltage drop of described anti-back biased diode D2.Can ensure that two-way power conversion chip U1, U2 are when Equations of The Second Kind electric loading LOAD2 startup optimization thus, can power for Equations of The Second Kind electric loading LOAD2 simultaneously, to achieve when Equations of The Second Kind electric loading LOAD2 starts by two-way power conversion chip is object that heavy load is powered simultaneously, enhance the load capacity of power supply, ensure that the stability of supply power voltage V2 when load LOAD2 starts.
After Equations of The Second Kind electric loading LOAD2 is stable, it is effective status (such as high level) that MCU puts the first enable signal EN1 and the second enable signal EN2, and juxtaposition the 3rd enable signal EN3 is disarmed state (such as low level).Now, the second road power conversion chip U2 keeps enable running status, continues as Equations of The Second Kind electric loading LOAD2 and powers, and ensures Equations of The Second Kind electric loading LOAD2 continuous service.Meanwhile, because the 3rd enable signal EN3 is low level, triode Q6 is ended, PMOS Q5 proceeds to off state because its grid voltage equals its source voltage, thus cutting off the transmission of the second enable signal EN2 to first via power conversion chip U1, the second enable signal EN2 is now only for controlling the enable operation of the second road power conversion chip U2.After Equations of The Second Kind electric loading LOAD2 is stable, the running status of first via power conversion chip U1 is controlled by the first enable signal EN1, namely the first enable signal EN1 of MCU output high level transfers to the Enable Pin EN of first via power conversion chip U1 by switching diode D1, control first via power conversion chip U1 enable operation after Equations of The Second Kind electric loading LOAD2 startup optimization to stable state, for first kind electric loading LOAD1 powers.Now, due to the first enable signal EN1 be high level, the 3rd enable signal EN3 is low level, therefore the triode Q1 saturation conduction of the feedback end FB of first via power conversion chip U1 is connected to, triode Q2 ends, namely the divider resistance being linked into the feedback end FB of first via power conversion chip U1 is R2 and R1, by reasonably configuring the resistance of divider resistance R2 and R1, make the supply power voltage V=V1 exported by first via power conversion chip U1, to meet the power demands of first kind electric loading LOAD1, control first kind electric loading LOAD1 startup optimization.In the present embodiment, the PMOS Q3 that conducting resistance is as far as possible little should be adopted, to reduce the conduction voltage drop on PMOS Q3.Because the starting current fluctuation of first kind electric loading LOAD1 is less, the tolerance range of power conversion chip U1 can not be exceeded, therefore can not impact the output of power circuit, ensure that the stability of power circuit output voltage.
First via power conversion chip U1 be first kind electric loading LOAD1 power time, limit described first via power conversion chip U1 export supply power voltage V≤V2-Va+V
d.Because fluctuation appears in the voltage exported once the second road power supply chip U2, minimum is V2-Va, if the supply power voltage V>V2-Va+V of then first via power conversion chip U1 output
d, then the output voltage of the second road power conversion chip U2 will become a clamper by anti-back biased diode D2 to the supply power voltage V-arrangement that first via power conversion chip U1 exports, and likely can have influence on the normal work of first kind electric loading LOAD1.So in order to ensure the normal operation of first kind electric loading LOAD1, the output voltage of first via power conversion chip U1 is less than and equals V2-Va+V
d, and the simultaneously first kind power demands of electric loading LOAD1.
In order to ensure that first via power conversion chip U1 is when for Equations of The Second Kind electricity consumption load supplying, its output voltage can not arrive first kind electric loading LOAD1, then possible overtension is avoided to cause damage to first kind electric loading LOAD1, the present embodiment is also connected with second switch circuit between the output OUT and first kind electric loading LOAD1 of first via power conversion chip U1, as shown in Figure 2.The the first enable signal EN1 utilizing MCU to export controls described second switch connecting and disconnecting of the circuit, to ensure when the output voltage V=V1 of first via power conversion chip U1, then transfers to first kind electric loading LOAD1, for first kind electric loading LOAD1 powers.
As a kind of preferred design of the present embodiment, described second switch circuit can adopt NPN type triode Q4 to coordinate PMOS Q3 to be formed by connecting.As shown in Figure 2, the source electrode of described PMOS Q3 is connected the output OUT of first via power conversion chip U1, and connect the grid of PMOS Q3 by configuration resistance R3.The drain electrode of described PMOS Q3 is connected first kind electric loading LOAD1, and grid connects the collector electrode of described NPN type triode Q4.The grounded emitter of described NPN type triode Q4, base stage receives the first enable signal EN1 that MCU exports.
During Equations of The Second Kind is with electric loading LOAD2 startup optimization; because the first enable signal EN1 exported by MCU is low level; therefore NPN type triode Q4 cut-off; PMOS Q3 turns off because its grid potential equals its source potential; avoid the voltage transmission exported by first via power conversion chip U1 to first kind electric loading LOAD1, realize the protection to load LOAD1.After MCU controls Equations of The Second Kind electric loading LOAD2 startup optimization a period of time (the described time can be determined from the time started to needed for even running reality according to load LOAD2), it is high level that MCU puts the first enable signal EN1, and the 3rd enable signal EN3 is low level.Now, NPN type triode Q4 enters saturation conduction state, drag down the grid potential of PMOS Q3, control PMOS Q3 saturation conduction, the voltage exported by first via power conversion chip U1 is made to be sent to first kind electric loading LOAD1, for providing the supply power voltage V1 needed for it with electric loading LOAD1, control first kind electric loading LOAD1 startup optimization.
Certainly, described second switch circuit also can adopt other switch elements design except NPN type triode Q4 and PMOS Q3 to realize, and such as PNP type triode, NMOS tube or controllable silicon, relay etc., the present embodiment is not limited in above citing.
After supply power voltage V1, V2 of being exported by two-way power conversion chip U1, U2 can carry out filtering process further by filter capacitor COUT1, the COUT2 being connected to power circuit outlet side, be resent to two class electric loading LOAD1, LOAD2, to improve the stability of load supplying further.
In the present embodiment, described two-way power conversion chip U1, U2 can adopt DC-DC conversion chip, and LDO voltage stabilizer also can be adopted to carry out the specific design of power circuit, and the present embodiment does not specifically limit this.
The Power Management Design scheme that proposes of application the present embodiment, can avoiding larger load starting current when starting excessive and the phenomenon of voltage instability that causes, enhancing the stability of power circuit.Described power circuit is applied in the electronic product such as acoustic equipment, video playback apparatus, stability and the reliability of electronic product operation can be improved.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement, also should belong to protection range of the present utility model.
Claims (10)
1. a power circuit, for being the different two class electricity consumption load supplyings of starting current, comprise first via power conversion chip and the second road power conversion chip, it is characterized in that: when two class electric loading described in needs start, described first via power conversion chip and the second road power conversion chip export the large supply power voltage needed for Equations of The Second Kind electric loading of starting current jointly, control Equations of The Second Kind electric loading first startup optimization, after Equations of The Second Kind electricity consumption load running is stable, described first via power conversion chip stops to Equations of The Second Kind electricity consumption load supplying, export the supply power voltage needed for first kind electric loading that starting current is little, control first kind electric loading at rear startup optimization.
2. power circuit according to claim 1, is characterized in that: described first via power conversion chip and the second road power conversion chip receive same road input power; The supply power voltage that described first via power conversion chip regulates it to export according to the feedback voltage level that its feedback end receives, described feedback end connects the output of first via power conversion chip by the bleeder circuit that a resistance is adjustable, and described bleeder circuit regulates by changing the divider resistance being connected to described feedback end the magnitude of voltage transferring to described feedback end.
3. power circuit according to claim 2, it is characterized in that: the supply power voltage needed for described first kind electric loading is less than the supply power voltage needed for Equations of The Second Kind electric loading, the output of described first via power conversion chip connects the output of the second road power conversion chip by an anti-back biased diode;
Described first via power conversion chip when being Equations of The Second Kind electricity consumption load supplying jointly with the second road power conversion chip, first via power conversion chip export supply power voltage V1=V2+Va+V
d;
Wherein, V2 is the supply power voltage that the second road power conversion chip exports; Va is the permission undulating value of the output voltage of the second road power conversion chip; V
dit is the conduction voltage drop of described anti-back biased diode;
When described first via power conversion chip is first kind electricity consumption load supplying, supply power voltage V≤V2-Va+V that first via power conversion chip exports
d.
4. the power circuit according to Claims 2 or 3, it is characterized in that: the control circuit being also provided with a control described first via power conversion chip and the enable operation of the second road power conversion chip in described power circuit, described control circuit needs to generate the first enable signal during startup optimization in first kind electric loading, transferred to the Enable Pin of first via power conversion chip by switching diode, need during startup optimization, to generate the Enable Pin that the second enable signal transfers to the second road power conversion chip in Equations of The Second Kind electric loading; Described second enable signal Equations of The Second Kind electric loading from start to stable during in transfer to the Enable Pin of first via power conversion chip, control the enable operation of first via power conversion chip, export power supply to Equations of The Second Kind electric loading.
5. power circuit according to claim 4, it is characterized in that: described second enable signal transfers to the Enable Pin of first via power conversion chip under the gating of the first switching circuit controls, described control circuit Equations of The Second Kind electric loading from start to stable during in export effective 3rd enable signal, transfer to the control end of the first switching circuit, control the signal transmission pathway between Enable Pin that described first switching circuit is communicated with the second enable signal and first via power conversion chip.
6. power circuit according to claim 5, it is characterized in that: in described first switching circuit, be provided with a NPN type triode and a PMOS, second enable signal described in source electrode reception of described PMOS, drain electrode connects the Enable Pin of first via power conversion chip, the grid of described PMOS connects the source electrode of described PMOS by a configuration resistance, and be connected with the collector electrode of described NPN type triode, the grounded emitter of described NPN type triode, the 3rd enable signal described in base stage receives.
7. power circuit according to claim 5, it is characterized in that: in described bleeder circuit, be provided with two switch elements and three divider resistances, wherein, between the output that second divider resistance is connected to first via power conversion chip and feedback end, the feedback end of described first via power conversion chip is leaded up to the switch ways of the first switch element and is connected the first divider resistance, and by the first divider resistance ground connection, the switch ways of second switch element of separately leading up to connects the 3rd divider resistance, and by the 3rd divider resistance ground connection; First enable signal described in control end reception of described first switch element, the 3rd enable signal described in control end reception of second switch element.
8. power circuit according to claim 4, it is characterized in that: the output of described first via power conversion chip connects first kind electric loading by second switch circuit, described second switch circuit receives the first enable signal that described control circuit exports, when described first enable signal is effective, be communicated with the current supply circuit between first via power conversion chip and first kind electric loading.
9. power circuit according to claim 8, it is characterized in that: in described second switch circuit, be provided with another NPN type triode and another PMOS, the source electrode of another PMOS described connects the output of first via power conversion chip, drain electrode connects first kind electric loading, grid connects the source electrode of another PMOS described by another configuration resistance, and be connected with the collector electrode of another NPN type triode described, the grounded emitter of another NPN type triode described, the first enable signal described in base stage receives.
10. an electronic product, is characterized in that: be provided with power circuit as claimed in any one of claims 1-9 wherein.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520131832.7U CN204442175U (en) | 2015-03-09 | 2015-03-09 | A kind of power circuit and there is the electronic product of described power circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520131832.7U CN204442175U (en) | 2015-03-09 | 2015-03-09 | A kind of power circuit and there is the electronic product of described power circuit |
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| CN204442175U true CN204442175U (en) | 2015-07-01 |
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| CN201520131832.7U Expired - Fee Related CN204442175U (en) | 2015-03-09 | 2015-03-09 | A kind of power circuit and there is the electronic product of described power circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682688A (en) * | 2015-03-09 | 2015-06-03 | 青岛歌尔声学科技有限公司 | Method for improving power supply stability during starting up and power circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682688A (en) * | 2015-03-09 | 2015-06-03 | 青岛歌尔声学科技有限公司 | Method for improving power supply stability during starting up and power circuit |
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Granted publication date: 20150701 |