CN110120740A - A kind of DC-DC variable voltage output circuit and terminal installation - Google Patents
A kind of DC-DC variable voltage output circuit and terminal installation Download PDFInfo
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- CN110120740A CN110120740A CN201810124539.6A CN201810124539A CN110120740A CN 110120740 A CN110120740 A CN 110120740A CN 201810124539 A CN201810124539 A CN 201810124539A CN 110120740 A CN110120740 A CN 110120740A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of DC-DC variable voltage output circuit and terminal installations, it is connect by inductance first end with the output pin of the DC-DC converter, first resistor first end, second resistance first end is connect with the feedback foot of DC-DC converter, inductance second end, the connection of first resistor second end and the output end as DC-DC variable voltage output circuit, second resistance second end ground connection, form the feed circuit when normal work of DC-DC, it is connect by the cathode of diode with the feedback foot of the DC-DC converter, the anode of diode is connect with 3rd resistor first end, form additional feedback circuit, and additional feedback circuit is controlled by controlling voltage, when television system is in standby, additional feedback circuit has an impact the feedback signal of DC-DC, D C-DC output voltage reduces, so that the input of the low pressure difference linear voltage regulator LDO network of rear end and output voltage difference reduce, LDO efficiency is improved, to achieve the effect that raising efficiency, achievees the effect that low-power consumption standby.
Description
Technical field
The present invention relates to DC-DC technical field, in particular to a kind of DC-DC variable voltage output circuit and terminal installation.
Background technique
DC-DC is also known as switching mode DC voltage change device, can be another electricity by a voltage values by DC-DC
Pressure value, DC-DC conversion chip be widely used in television system.
DC-DC design in television system is general by the way of fixed output, only gives SOC chip CPU core and GPU
The DC-DC of the nuclear power part of kernel power supply is by the way of variable voltage output.There are two types of modes for the output of DC-DC variable voltage:
(1) design method for directly increasing and changing Feedback feedback network (hereinafter referred to as FB network) to ground resistance all the way is used,
This design method can cause the voltage jump switched under two states, if both front and back of-state voltage variable quantity is crossed conference and drawn
Play system operation irregularity；(2) a certain range variation, but such design method are exported using bus marco DC-DC according to demand
SOC or MCU is needed to be controlled, system complex.
In the prior art, on the one hand, due to the output of existing DC-DC variable voltage since voltage jump, system complex are uncomfortable
Preferably stand-by circuit is used to use, on the other hand, due to needing two sets of standby powers when separate television is standby, leads to standby static state
Power consumption increases, be badly in need of a kind of new mode reduce it is standby under power consumption.
Summary of the invention
The present invention provides a kind of DC-DC variable voltage output circuit and terminal installation, to solve the problems of the prior art,
Standby voltage is reduced, achievees the effect that low-power consumption standby.
The present invention provides a kind of DC-DC variable voltage output circuit, and the DC-DC variable voltage output circuit includes: DC-
DC converter, first resistor, second resistance, 3rd resistor, inductance, diode,
The inductance first end is connect with the output pin of the DC-DC converter, the first resistor first end, described
Two resistance first ends are connect with the feedback foot of the DC-DC converter, the inductance second end, the first resistor second end
It connects and the output end as the DC-DC variable voltage output circuit, the second resistance second end is grounded；
The cathode of the diode is connect with the feedback foot of the DC-DC converter, the anode of the diode with it is described
The connection of 3rd resistor first end, the 3rd resistor second end are connect with control voltage input end.
Preferably, the DC-DC variable voltage output circuit further includes capacitor, the capacitor first end and described the
The connection of three resistance first ends, the capacitor second end ground connection.
Preferably, the DC-DC variable voltage output circuit further includes the 4th resistance, the anode of the diode with
It is connected between the 3rd resistor first end by the 4th resistance.
Preferably, the DC-DC variable voltage output circuit further includes the 4th resistance, the cathode of the diode with
It is connected between the feedback foot of the DC-DC converter by the 4th resistance.
The embodiment of the invention provides another DC-DC variable voltage output circuit, the DC-DC variable voltage output electricity
Road includes: DC-DC converter, first resistor, second resistance, 3rd resistor, the 4th resistance, inductance, diode,
The inductance first end is connect with the output pin of the DC-DC converter, the first resistor first end, described
Two resistance first ends are connect with the feedback foot of the DC-DC converter, the inductance second end, the first resistor second end
Connection and the output end as the DC-DC variable voltage output circuit；
The 3rd resistor first end, the diode cathode connect with the second resistance second end, described
Three resistance second ends ground connection, the anode of the diode are connect with the 4th resistance first end, the 4th resistance second end
It is connect with control voltage input end.
Preferably, the DC-DC variable voltage output circuit further includes capacitor, the capacitor first end and described the
The connection of four resistance first ends, the capacitor second end ground connection.
Preferably, the DC-DC variable voltage output circuit further includes the 5th resistance, the anode of the diode with
It is connected between the 4th resistance first end by the 5th resistance.
Preferably, the DC-DC variable voltage output circuit further includes the 5th resistance, the cathode of the diode with
It is connected between the second resistance second end by the 5th resistance.
The embodiment of the invention provides another DC-DC variable voltage output circuit, the DC-DC variable voltage output electricity
Road includes: DC-DC converter, first resistor, second resistance, 3rd resistor, the 4th resistance, inductance, diode,
The inductance first end is connect with the output pin of the DC-DC converter, the inductance second end, first electricity
Hinder first end connection and the output end as the DC-DC variable voltage output circuit；The second resistance first end with it is described
The first end of 3rd resistor connects, the second end ground connection of the 3rd resistor；
The first resistor second end, the second resistance second end are connect with the cathode of the diode, and described two
The anode of pole pipe is connect with the 4th resistance first end, and the 4th resistance second end is connect with control voltage input end.
The embodiment of the invention provides a kind of terminal installation, the terminal installation includes the DC- provided in above embodiments
DC variable voltage output circuit.
Compared with prior art, the advantageous effects for the technical solution that the embodiment of the present application proposes include at least:
A kind of DC-DC variable voltage output circuit and terminal installation provided in an embodiment of the present invention, pass through inductance first end
Connect with the output pin of the DC-DC converter, first resistor first end, second resistance first end with DC-DC converter
Foot connection is fed back, inductance second end, first resistor second end connects and the output end as DC-DC variable voltage output circuit,
Second resistance second end ground connection, forms the feed circuit when normal work of DC-DC, passes through the cathode and the DC- of diode
The feedback foot of DC converter connects, and the anode of diode is connect with 3rd resistor first end, forms additional feedback circuit, and pass through
Control voltage controls being switched on or switched off for additional feedback circuit, so that television system is under normal work and ideal case
Using different feed circuits, i.e., when television system is in normal operating conditions, control voltage Vc exports low level, additional anti-
Current feed circuit does not have an impact the feedback signal of DC-DC；When television system is in standby, the high electricity of control voltage output
Flat, the additional feedback circuit that 3rd resistor is formed has an impact the feedback signal of DC-DC, since the feedback voltage of DC-DC is
Fixed value, after additionally introducing input source by 3rd resistor, DC-DC output voltage is reduced, so that the low pressure difference linearity of rear end
The input of voltage-stablizer LDO network and output voltage difference reduce, due to LDO efficiency=output voltage/input voltage, when input with it is defeated
When voltage difference reduces out, LDO efficiency is improved, to achieve the effect that raising efficiency, achievees the effect that low-power consumption standby.
Detailed description of the invention
Fig. 1 is a kind of DC-DC variable voltage output circuit schematic diagram that the embodiment of the present invention proposes；
Fig. 2 is a kind of DC-DC variable voltage output circuit simplification figure that the embodiment of the present invention proposes；
Fig. 3 is another DC-DC variable voltage output circuit schematic diagram that the embodiment of the present invention proposes；
Fig. 4 is the schematic diagram that the DC-DC variable voltage output circuit that the embodiment of the present invention proposes accesses integrated circuit network；
Fig. 5 is another DC-DC variable voltage output circuit simplification figure that the embodiment of the present invention proposes；
Fig. 6 is another DC-DC variable voltage output circuit schematic diagram that the embodiment of the present invention proposes；
Fig. 7 is another DC-DC variable voltage output circuit simplification figure that the embodiment of the present invention proposes；
Fig. 8 is that another DC-DC variable voltage output circuit that the embodiment of the present invention proposes is intended to；
Fig. 9 is that another DC-DC variable voltage output circuit that the embodiment of the present invention proposes is intended to；
Figure 10 is that another DC-DC variable voltage output circuit that the embodiment of the present invention proposes is intended to；
A kind of control voltage Vc way of output that Figure 11 embodiment of the present invention proposes；
Another control voltage Vc way of output that Figure 12 embodiment of the present invention proposes；
Another control voltage Vc way of output that Figure 13 embodiment of the present invention proposes；
Another control voltage Vc way of output that Figure 14 embodiment of the present invention proposes；
Another control voltage Vc way of output that Figure 15 embodiment of the present invention proposes.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Embodiment one: the embodiment of the present invention provides a kind of DC-DC variable voltage output circuit, as shown in Figure 1, the DC-
DC variable voltage output circuit includes DC-DC converter, first resistor R1, second resistance R2,3rd resistor R3, inductance L1, two
Pole pipe D1, the inductance L1 first end are connect with the output pin of the DC-DC converter, the first resistor R1 first end, institute
It states second resistance R2 first end to connect with the feedback foot of the DC-DC converter, the inductance L1 second end, first electricity
The connection of R1 second end and the output end as the DC-DC variable voltage output circuit are hindered, the second resistance R2 second is terminated
Ground forms feed circuit when working normally, in the case where television system is switched on and works normally, the feed circuit work of this part
Make, it is ensured that the normal work of television system.
As shown in Figure 1, in a kind of DC-DC variable voltage output circuit provided in an embodiment of the present invention, the diode D1
Cathode connect with the feedback foot of the DC-DC converter, the anode of the diode D1 and the 3rd resistor R3 first end
Connection, the 3rd resistor R3 second end are connect with control voltage input end, increased additional feedback circuit when forming standby, and
Feed circuit is controlled by controlling voltage input end.
Specifically by taking the standby 5V of television system power supply as an example, standby 5V power supply is steady mainly for the low pressure difference linearity of 3.3V
Depressor LDO power supply, LDO is a kind of linear voltage regulator, using the transistor or FET run in its linear region, from application
The voltage of excess is subtracted in input voltage, generates the output voltage through overregulating.Efficiency=output voltage/input voltage of LDO,
It therefore, can be by reducing the difference inputted with output voltage, the efficiency of Lai Tigao LDO.
In the specific implementation process, when television system normal operating conditions, control voltage Vc exports low level, diode
The anode of D1 is low level, and diode D1 is due to reverse bias and by the feedback signal of DC-DC is only by first resistor at this time
The feed circuit control that R1, second resistance R2 are constituted, DC-DC export normal working voltage Vo, and circuit reduction figure is as shown in Figure 2.
When television system is in standby, as shown in Figure 1, control voltage Vc exports high level, diode D1 anode
For high level, diode D1 conducting, the additional feedback circuit that 3rd resistor R3 is formed has an impact the feedback signal of DC-DC,
Since the feedback voltage Vfb of DC-DC is fixed value, after additionally introducing the input source of Vd by 3rd resistor R3, DC-DC output
Voltage Vo is reduced, so that the input of the low pressure difference linear voltage regulator LDO network of rear end and output voltage difference reduce, since LDO is imitated
Rate=output voltage/input voltage, when input is reduced with output voltage difference, LDO efficiency is improved, to reach promotion effect
The effect of rate, achievees the effect that low-power consumption standby.
As shown in figure 3, the DC-DC variable voltage output circuit provided in the preferred embodiment of the present invention further includes capacitor C2,
The capacitor C2 first end is connect with the 3rd resistor R3 first end, and the capacitor C2 second end ground connection is formed in standby mistake
Additional feedback circuit connects the delay of process in journey, and the DC-DC variable voltage provided in the preferred embodiment of the present invention is exported electricity
The schematic diagram that integrated circuit network is accessed on road is as shown in Figure 4.
In standby, level reduction is too fast to will lead to system exception, and capacitor C2 and 3rd resistor R3 form additional anti-
Current feed circuit connects the delay of process, when television system is in standby, controls voltage output high level, high level passes through the
Three resistance R3 charge to capacitor C2, and when the level of capacitor C2 reaches the Vfb+Vd of DC-DC, the voltage of diode D1 reaches conducting
Voltage, the additional feedback circuit that 3rd resistor R3 is formed have an impact the feedback signal of DC-DC, circuit reduction figure such as Fig. 5 institute
Show, in this process, with gradually increasing for capacitor C2 level, the conducting electric current of diode D1 is gradually increased, so that passing through
The input source Vc-Vd that 3rd resistor R3 is additionally introduced is gradually increased, since the feedback voltage of DC-DC is fixed value, when passing through the
When the input source that three resistance R3 additionally introduce Vc-Vd is gradually increased, DC-DC output voltage Vo is gradually decreased, to reach DC-DC
The effect that output voltage is not mutated.
The DC-DC variable voltage output circuit provided in the preferred embodiment of the present invention further includes the 4th resistance R4, and described two
By the 4th resistance R4 connection between the anode of pole pipe D1 and the 3rd resistor R3 first end, specifically, such as Fig. 6 institute
Show, the anode of diode D1 connects one end of the 4th resistance R4, and the other end of the 4th resistance R4 connects 3rd resistor R3, is formed
The delay of additional feedback circuit disconnection process during becoming open state from standby mode.
During becoming open state from standby mode, level restores too fast and also results in system exception, the 4th resistance
R4 and capacitor C2 forms the delay of additional feedback circuit disconnection process, when becoming open state from standby mode, controls voltage
Vc exports low level, and capacitor C2 starts to discharge, and circuit reduction figure is as shown in fig. 7, as capacitor C2 level gradually decreases, diode
The electric current of D1 is gradually reduced, so that the input source Vc-Vd additionally introduced by 3rd resistor R3 is gradually reduced, due to DC-DC's
Feedback voltage is fixed value, when the input source additionally introduced by 3rd resistor R3 is gradually reduced, DC-DC output voltage Vo by
Gradually rise, when the electric current of diode D1 is reduced to 0, diode D1 is disconnected, and the additional feedback circuit that 3rd resistor R3 is formed is from DC-
It is disconnected in the feed circuit of DC, the feedback signal of DC-DC is formed feedback when working normally by first resistor R1, second resistance R2
Circuit influences, and DC-DC output voltage Vo is restored to normal working voltage, to realize the gradually extensive of DC-DC output voltage Vo
It is multiple, to achieve the effect that DC-DC output voltage is not mutated.
As shown in figure 8, the DC-DC variable voltage output circuit provided in the preferred embodiment of the present invention further includes the 4th resistance
R4, by the 4th resistance R4 connection between the cathode of the diode D1 and the feedback foot of the DC-DC converter, specifically
Ground, the feedback foot of DC-DC converter connect one end of the 4th resistance R4, the yin of the other end connection diode D1 of the 4th resistance R4
Pole, be formed in from standby mode become open state during additional feedback circuit disconnection process delay.
Embodiment two: based on design of the invention, another DC-DC variable voltage output electricity provided in an embodiment of the present invention
Road, as shown in Figure 9, comprising: DC-DC converter, first resistor R1, second resistance R21,3rd resistor R22, the 4th resistance R3,
Inductance L1, diode D1, the inductance L1 first end are connect with the output pin of the DC-DC converter, the first resistor R1
First end, the second resistance R21 first end are connect with the feedback foot of the DC-DC converter, the inductance L1 second end,
The first resistor R1 second end connection and the output end as the DC-DC variable voltage output circuit, the 3rd resistor
R22 first end, the diode D1 cathode connect with the second resistance second end, the 3rd resistor R22 second end
Ground connection, the anode of the diode D1 are connect with the 4th resistance R3 first end, the 4th resistance R3 second end and control
Voltage input end connection.
It should be pointed out that first resistor R1, second resistance R21,3rd resistor R22 in the present embodiment, not implement
First resistor R1, second resistance R2,3rd resistor R3 in example one.
In the preferred embodiment of the present invention, as shown in figure 9, the DC-DC variable voltage output circuit further includes capacitor C2, institute
It states capacitor C2 first end to connect with the 4th resistance R3 first end, the capacitor C2 second end ground connection.
Specifically, first resistor R1, second resistance R21,3rd resistor R22 form feed circuit when working normally,
In the case that television system booting works normally, the feed circuit of this part works, it is ensured that the normal work of television system；It is described
4th resistance R3 increased additional feedback circuit when forming standby, and feed circuit is controlled by controlling voltage；Capacitor
C2 and the 4th resistance R3 forms the delay that additional feedback circuit connects process.
When television system normal operating conditions, control voltage Vc exports low level, and the anode of diode D1 is low level,
Diode D1 is due to reverse bias and by the feedback signal of DC-DC is only by first resistor R1, second resistance R21, the at this time
The feed circuit control that three resistance R22 are constituted, DC-DC export normal working voltage Vo.
When television system is in standby, control voltage Vc exports high level, and the anode of diode D1 is high level,
Diode D1 conducting, capacitor C2 and the 4th resistance R3 form additional feedback circuit and connect the delay circuit of process to the anti-of DC-DC
Feedback signal has an impact, since the feedback voltage of DC-DC is fixed value, when additionally introducing the defeated of Vc-Vd by the 4th resistance R3
After entering source, DC-DC output voltage Vo is gradually decreased.
In the preferred embodiment of the present invention, the DC-DC variable voltage output circuit further includes the 5th resistance R4, the 5th resistance
The connection type of R4 includes two kinds:
Connection type one: pass through the 5th electricity between the anode of the diode D1 and the 4th resistance R3 first end
Hinder R4 connection.
Connection type two: pass through the described 5th between the D1 cathode of the diode and the second resistance R21 second end
Resistance R4 connection.
During becoming open state from standby mode, level restores too fast and also results in system exception, the 5th resistance
R4 and capacitor C2 forms the delay of additional feedback circuit disconnection process, when becoming open state from standby mode, controls voltage
Vc exports low level, and capacitor C2 starts to discharge, and as capacitor C2 level gradually decreases, the electric current of diode D1 is gradually reduced, DC-
DC output voltage Vo is gradually increasing, and when the electric current of diode D1 is reduced to 0, diode D1 is disconnected, the volume that the 4th resistance R3 is formed
External feedback circuit is disconnected from the feed circuit of DC-DC, so that being gradually recovered for DC-DC output voltage Vo is realized, to reach
The effect not being mutated to DC-DC output voltage.
Embodiment three: based on design of the invention, another DC-DC variable voltage output electricity provided in an embodiment of the present invention
Road, as shown in Figure 10, the DC-DC variable voltage output circuit include: first resistor R1, second resistance R21,3rd resistor
R22, the 4th resistance R3, inductance L1, diode D1, the inductance L1 first end are connect with the output pin of the DC-DC converter,
The inductance L1 second end, the first resistor R1 first end connect and as the defeated of the DC-DC variable voltage output circuit
Outlet；The second resistance R21 first end is connect with the 3rd resistor R22 first end, and the 3rd resistor R22 second is terminated
Ground；The first resistor R1 second end, the second resistance R21 second end are connect with the cathode of the diode, and described two
The anode of pole pipe is connect with the 4th resistance R3 first end, and the 4th resistance R3 second end and control voltage input end connect
It connects.
It should be pointed out that first resistor R1, second resistance R21,3rd resistor R22 in the present embodiment, not implement
First resistor R1, second resistance R2,3rd resistor R3 in example one.
Example IV:
The embodiment of the invention provides a kind of terminal installation, the terminal installation includes the DC- provided in above embodiments
DC variable voltage output circuit.
For the technical idea that the present invention is further explained, now in conjunction with specific embodiment, to technical solution of the present invention
It is illustrated.
Energy-efficient demand is gradually increased now with country and industry, the requirement to product stand-by power consumption is also increasingly
Height, it is gradually excessive to 0.3W from 0.5W before.But as television system architectures gradually complicate, especially optical fiber/wireless is passed
The problem of power supply can not be shared between defeated bring separation TV host and screen, low standby power loss is set to design difficulty more next
It is bigger.
By taking the standby 5V power supply in television system as an example, standby 5V power supply makes the specific embodiment of the invention mainly for standby
Remote control head, part 5V pull-up, lamp effect, standby 3.3V LDO power supply, wherein remote control head input voltage range is bigger, generally
For 3V or more can work normally；Most of SOC 5V pressure resistance pin decision levels are designed also according to 3.3V；Lamp effect
As long as part resistance value selection is suitable, 5V power supply only will affect brightness again below 5V power supply；As long as the LDO for 3.3V is higher than
The minimum value of VIN, at the input voltage the end of month, efficiency is higher.This several part can all reach energy-efficient effect after the reduction of 5V voltage.
The main thought of the specific embodiment of the invention includes: that (1) increases additional control loop on FB network, makes FB net
Network is being switched on and is using different feedback networks under ideal case；It (2) is to achieve the effect that DC-DC output voltage is not mutated increase
Time delay network.
The specific embodiment of the invention one: as shown in figure 3, increasing tri- diode D1, capacitor C2,3rd resistor R3 devices
And control voltage Vc, wherein 3rd resistor R3 and capacitor C2 constitutes delay circuit, guarantees system power supply state from normal work shape
When state is switched to standby mode, DC-DC output level is gradually decreased, and is not mutated, and diode D1 can prevent C2 pairs of capacitor
The feed circuit of the DC-DC to work has an impact.
Under normal boot-strap state:
(1) voltage Vc input low level is controlled, diode D1 is low level close to the side capacitor C2；
(2) feedback signal of DC-DC is only controlled by the first resistor R1 and second resistance R2 feed circuit constituted, DC-DC
Normal working voltage Vo is exported, circuit reduction figure is as shown in Figure 2.
Under standby mode:
(1) voltage Vc input high level is controlled, is charged by 3rd resistor R3 to capacitor C2；
(2) after capacitor C2 level reaches Vfb+Vd (conducting voltage of diode D1) of DC-DC, 3rd resistor R3 is formed
Additional feedback circuit the feedback signal of DC-DC circuit is had an impact, circuit reduction figure is as shown in Figure 5；
(3) since the feedback voltage of DC-DC is fixed value, when the input source for additionally introducing Vc-Vd by 3rd resistor R3
Afterwards, the output voltage Vo of DC-DC is reduced；
(4) in this process, increasing with capacitor C2 level, diode D1 are gradually turned on, and conducting electric current by
It is cumulative big, so that the output voltage Vo of DC-DC is gradually decreased, to achieve the effect that standby level reduction.
When being switched on again from standby mode:
(1) control voltage Vc incoming level is lower；
(2) capacitor C2 starts to discharge, since capacitor C2 level can be maintained at electric diode D1 electric conduction in the standby state
Pressure, once capacitor C2 starts to discharge, diode D1 on state can rapidly by；
(3) after diode D1 is disconnected, the additional feedback circuit that 3rd resistor R3 is formed breaks from the feed circuit of DC-DC
It opens；
(4) DC-DC output voltage Vo can be promptly restored to normal level.
The specific embodiment of the invention two: when standby mode is switched on again, level, which restores too fast, can also have system exception,
Delay circuit when standby mode is switched on again: the 4th resistance R4 is increased in the specific embodiment of the invention two, as shown in Figure 6.
Under normal boot-strap state:
(1) voltage Vc input low level is controlled, diode D1 is low level close to the 4th side resistance R4；
(2) feedback signal of DC-DC is only controlled by the first resistor R1 and second resistance R2 feed circuit constituted, DC-DC
Normal working voltage Vo is exported, circuit reduction figure is as shown in Figure 2.
Under standby mode:
(1) voltage Vc input high level is controlled, is charged by 3rd resistor R3 to capacitor C2；
(2) after capacitor C2 level reaches Vfb+Vd (conducting voltage of diode D1) of the DC-DC of diode D1, third
The additional feedback circuit that resistance R3 is formed has an impact the feedback signal of DC-DC, and circuit reduction figure is as shown in Figure 7；
(3) since the feedback voltage of DC-DC is fixed value, when the input source for additionally introducing Vc-Vd by 3rd resistor R3
Afterwards, the output voltage Vo of DC-DC is reduced；
(4) in this process, increasing with capacitor C2 level, diode D1 are gradually turned on, and conducting electric current by
It is cumulative big, so that the output voltage Vo of DC-DC is gradually decreased, to achieve the effect that standby level reduction.
When being switched on again from standby mode:
(1) control voltage Vc incoming level is lower；
(2) capacitor C2 starts to discharge, and with the reduction of capacitor C2 level, is gradually reduced by the electric current of diode D1, from
And the output voltage Vo level of DC-DC is gradually increasing；
(3) after diode D1 electric current is reduced to 0, the feedback of additional feedback circuit from DC-DC that 3rd resistor R3 is formed are electric
Road disconnects；
(4) the output voltage Vo of DC-DC is restored to normal level.
The specific embodiment of the invention three: the position of the 4th resistance R4 of the specific embodiment of the invention two and capacitor C2 is mutual
It changes, as shown in Figure 8.
The specific embodiment of the invention four: additional feedback circuit, which nor is it necessary that, to be connected on the feedback foot of DC-DC converter,
One in first resistor R1 or second resistance R2 can be divided into two resistance, additional feedback circuit connection to two resistance
Center, as shown in Figure 9 and Figure 10.
This programme is started with from mainboard end, by adjusting DC-DC in the standby output voltage different under switch on condition, that is, is led to
The feed circuit for crossing adjustment DC-DC is exported in booting from DC-DC under ideal case using different parameters, is reduced under ideal case
Voltage promotes mainboard efficiency under ideal case, reduces mainboard power consumption, achievees the effect that low-power consumption standby, reach energy-efficient effect.
Wherein, in the specific embodiment of the invention, control voltage Vc can be the control for passing through the control output that GPIO is chip
Voltage Vc, or by the control voltage Vc of the control output after triode, it is standby to export different level with when being switched on, specifically
Implementation include following several:
(1) as shown in figure 11, PMos is used, GPIO exports low level when standby, and Vo and Vc is managed by PMos at this time
Connection, Vc are high level；When booting, GPIO exports high level, and PMos pipe is closed, and Vo is disconnected with Vc, and Vc is low level.
(2) as shown in figure 12, one end of PMos pipe with it is other standby when the power supply that charges connect, when standby, GPIO output
Low level, Vc are connect with standby power；When booting, GPIO exports high level, and Vc is low level.
(3) as shown in figure 13, Vc is directly connect with GPIO, is connected on standby power by pull-up resistor, when standby,
GPIO exports high level, and Vc is high level, and GPIO exports low level when booting, and Vc is low level.
It (4) as shown in figure 14, is the deformation of (3), when standby, GPIO exports low level, triode cut-off, and Vc is high electricity
It is flat；GPIO exports high level when booting, and triode ON, Vc is low level.
(5) such as Figure 15, when being standby, the power supply output of standby power down is low level, and triode is closed, and Vc is high electricity at this time
It is flat.
It will be appreciated by those skilled in the art that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, module in attached drawing or
Process is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in implement scene can be described according to implement scene into
Row is distributed in the device of implement scene, can also be carried out corresponding change and is located at the one or more dresses for being different from this implement scene
In setting.The module of above-mentioned implement scene can be merged into a module, can also be further split into multiple submodule.
Aforementioned present invention serial number is for illustration only, does not represent the superiority and inferiority of implement scene.
Disclosed above is only several specific implementation scenes of the invention, and still, the present invention is not limited to this, Ren Heben
What the technical staff in field can think variation should all fall into protection scope of the present invention.
Claims (10)
1. a kind of DC-DC variable voltage output circuit, which is characterized in that the DC-DC variable voltage output circuit includes: DC-
DC converter, first resistor, second resistance, 3rd resistor, inductance, diode,
The inductance first end is connect with the output pin of the DC-DC converter, the first resistor first end, second electricity
Resistance first end is connect with the feedback foot of the DC-DC converter, the inductance second end, first resistor second end connection
And the output end as the DC-DC variable voltage output circuit, the second resistance second end ground connection；
The cathode of the diode is connect with the feedback foot of the DC-DC converter, the anode of the diode and the third
The connection of resistance first end, the 3rd resistor second end are connect with control voltage input end.
2. DC-DC variable voltage output circuit as described in claim 1, which is characterized in that the DC-DC variable voltage output
Circuit further includes capacitor, and the capacitor first end is connect with the 3rd resistor first end, the capacitor second end ground connection.
3. such as the described in any item DC-DC variable voltage output circuits of claim 1-2, which is characterized in that the DC-DC is variable
Voltage follower circuit further includes the 4th resistance, passes through described the between the anode of the diode and the 3rd resistor first end
The connection of four resistance.
4. such as the described in any item DC-DC variable voltage output circuits of claim 1-2, which is characterized in that the DC-DC is variable
Voltage follower circuit further includes the 4th resistance, is passed through between the cathode of the diode and the feedback foot of the DC-DC converter
The 4th resistance connection.
5. a kind of DC-DC variable voltage output circuit, which is characterized in that the DC-DC variable voltage output circuit includes: DC-
DC converter, first resistor, second resistance, 3rd resistor, the 4th resistance, inductance, diode,
The inductance first end is connect with the output pin of the DC-DC converter, the first resistor first end, second electricity
Resistance first end is connect with the feedback foot of the DC-DC converter, the inductance second end, first resistor second end connection
And the output end as the DC-DC variable voltage output circuit；
The 3rd resistor first end, the diode cathode connect with the second resistance second end, third electricity
Second end ground connection is hindered, the anode of the diode is connect with the 4th resistance first end, the 4th resistance second end and control
Voltage input end connection processed.
6. DC-DC variable voltage output circuit as claimed in claim 5, which is characterized in that the DC-DC variable voltage output
Circuit further includes capacitor, and the capacitor first end is connect with the 4th resistance first end, the capacitor second end ground connection.
7. such as the described in any item DC-DC variable voltage output circuits of claim 5-6, which is characterized in that the DC-DC is variable
Voltage follower circuit further includes the 5th resistance, passes through described the between the anode of the diode and the 4th resistance first end
The connection of five resistance.
8. such as the described in any item DC-DC variable voltage output circuits of claim 5-6, which is characterized in that the DC-DC is variable
Voltage follower circuit further includes the 5th resistance, passes through described the between the cathode of the diode and the second resistance second end
The connection of five resistance.
9. a kind of DC-DC variable voltage output circuit, which is characterized in that the DC-DC variable voltage output circuit includes: DC-
DC converter, first resistor, second resistance, 3rd resistor, the 4th resistance, inductance, diode,
The inductance first end is connect with the output pin of the DC-DC converter, the inductance second end, the first resistor
One end connection and the output end as the DC-DC variable voltage output circuit；The second resistance first end and the third
The first end of resistance connects, the second end ground connection of the 3rd resistor；
The first resistor second end, the second resistance second end are connect with the cathode of the diode, the diode
Anode connect with the 4th resistance first end, the 4th resistance second end with control voltage input end connect.
10. a kind of terminal installation, which is characterized in that the terminal installation includes such as any one of claim 1,5,9 claim
The DC-DC variable voltage output circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810124539.6A CN110120740A (en) | 2018-02-07 | 2018-02-07 | A kind of DC-DC variable voltage output circuit and terminal installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810124539.6A CN110120740A (en) | 2018-02-07 | 2018-02-07 | A kind of DC-DC variable voltage output circuit and terminal installation |
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| Publication Number | Publication Date |
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| CN110120740A true CN110120740A (en) | 2019-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810124539.6A Pending CN110120740A (en) | 2018-02-07 | 2018-02-07 | A kind of DC-DC variable voltage output circuit and terminal installation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114488867A (en) * | 2021-12-09 | 2022-05-13 | 天津大学青岛海洋技术研究院 | Buoy profile motion and data acquisition controller and using method thereof |
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| CN203289323U (en) * | 2013-05-21 | 2013-11-13 | Tcl通力电子（惠州）有限公司 | Power supply circuit and switching power supply |
| CN106921293A (en) * | 2017-05-08 | 2017-07-04 | 深圳陆巡科技有限公司 | Based on it is numerically controlled can real time linear regulation output DC DC translation circuits |
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| CN102468767A (en) * | 2010-11-08 | 2012-05-23 | 泰商泰达电子公司 | Power supply circuit |
| CN202309922U (en) * | 2011-03-08 | 2012-07-04 | 青岛海信电器股份有限公司 | Low power consumption standby circuit and television set |
| CN102931842A (en) * | 2012-10-12 | 2013-02-13 | 华为技术有限公司 | Chip dynamic voltage regulating circuit and terminal equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114488867A (en) * | 2021-12-09 | 2022-05-13 | 天津大学青岛海洋技术研究院 | Buoy profile motion and data acquisition controller and using method thereof |
| CN114488867B (en) * | 2021-12-09 | 2023-06-16 | 天津大学青岛海洋技术研究院 | Buoy profile motion and data acquisition controller and use method thereof |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant after: Hisense Video Technology Co.,Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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Application publication date: 20190813 |