CN110289758A - A kind of low-power consumption power supply circuit and electronic equipment - Google Patents
A kind of low-power consumption power supply circuit and electronic equipment Download PDFInfo
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- CN110289758A CN110289758A CN201910512002.1A CN201910512002A CN110289758A CN 110289758 A CN110289758 A CN 110289758A CN 201910512002 A CN201910512002 A CN 201910512002A CN 110289758 A CN110289758 A CN 110289758A
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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
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Abstract
The invention discloses a kind of low-power consumption power supply circuit and electronic equipments, including a main DC-DC chip and at least one secondary DC-DC chip parallel with one another；In system electrification, main DC-DC chip starting operation, all secondary DC-DC chips close, detect the output electric current I of main DC-DC chip: working as I > IHWhen, control secondary DC-DC chip is run one by one, until IL<I<IH；As I < ILAnd when having the operation of secondary DC-DC chip, controls secondary DC-DC chip in operating status and close one by one, until IL<I<IH；Wherein, ILFor low current threshold value, IHFor high current threshold value, and IL<IO<IH, IOFor output current value of the DC-DC chip operation in maximum power transfer efficiency.Using power supply circuit of the invention, the calorific value and energy loss of DC-DC chip can be reduced when system power is larger, and then achieve the purpose that reduce system power dissipation.
Description
Technical field
The invention belongs to power supply circuit technical fields, specifically, being to be related to a kind of DC-DC for reducing system power dissipation
Power supply circuit.
Background technique
User is more demanding to the stand-by time of electronic equipment when using battery powered portable electronic device.?
In practical application, the operation power consumption of especially certain sub- equipment of trade power consumption is larger, in current limited battery technology horizontal bar
It is the main means for extending electronic equipment stand-by time using the system power dissipation for reducing electronic equipment to the maximum extent under part.
In the design for the power supply circuit that DC-DC power supply chip (DC-DC chip) is usually used in electronic equipment, effect is
The DC voltage of a certain amplitude is converted into the DC voltage of another amplitude, such as 12V DC voltage is converted into 5V direct current
Pressure, to meet the power demand loaded in electronic equipment.But DC-DC chip exists in various degree in power supply conversion process
Energy loss, and follow that transfer efficiency is higher, the fewer rule of energy loss.Transfer efficiency is usually expressed as a percentage, DC-
The energy conversion efficiency of DC chip in use generally can achieve between 80%-95%.
The energy conversion efficiency of DC-DC chip is not fixed value, and when exporting electric current difference, transfer efficiency would generally phase
Poor 5%-15%.When system power is larger, if DC-DC chip long-term work will lead to DC-DC core in high current
Piece fever is serious, and energy loss increases, and then the energy content of battery is caused to consume excessively, shortens the stand-by time of electronic equipment.This
Outside, DC-DC chip generates heat, and also will affect the service life of DC-DC chip, reduces electronic equipment reliability of operation.
Summary of the invention
The present invention is based on multiple DC-DC chips to design power supply circuit, when system power is larger, by dividing system power
It spreads out on multiple DC-DC chips, so as to reduce the load of single DC-DC chip, reduces calorific value and the energy of DC-DC chip
Amount loss, then reaches the purpose of design for reducing system power dissipation.
In order to solve the above technical problems, the present invention is achieved by the following scheme:
In one aspect, the invention proposes a kind of low-power consumption power supply circuits, including DC-DC chip, current detecting unit
And control unit；The DC-DC chip receives DC input voitage, and DC output voltage needed for converting output loading；Institute
Stating DC-DC chip includes multiple and parallel with one another, respectively main DC-DC chip and at least one secondary DC-DC chip, described
Main DC-DC chip is run upon power-up of the system；The current detecting unit detects the output electric current I of the main DC-DC chip；Institute
It states control unit to be carried out control as follows according to working condition of the output electric current I to secondary DC-DC chip: starting in system and run
Afterwards, all secondary DC-DC chips are controlled first to close；Work as I > IHWhen, control secondary DC-DC chip is run one by one, until IL<I<IH；
As I < ILAnd when having the operation of secondary DC-DC chip, controls secondary DC-DC chip in operating status and close one by one, until IL<I<IH；
Wherein, ILFor low current threshold value, IHFor high current threshold value, and IL<IO<IH, IOIt is converted for DC-DC chip operation in its maximum power
Output current value when efficiency M.
Preferably, the high current threshold value IHValue mode are as follows: when the DC-DC chip output electric current be IHWhen,
The energy conversion efficiency of DC-DC chip should be greater than M-2%, be turned with guaranteeing that DC-DC chip can operate in its maximum power as far as possible
It changes near efficiency, and IO<IH<2IO。
In order to guarantee secondary DC-DC chip in the initial stage put into operation, the output electric current of main DC-DC chip will not be because of
The access of secondary DC-DC chip and be reduced to low current threshold value ILHereinafter, then influencing the normal operation of power supply circuit, the present invention is excellent
Choosing designs the low current threshold value
Further, the output electric current of DC-DC chip described in preferred design is ILWhen, the electric energy of DC-DC chip converts effect
Rate is greater than M-10%, to guarantee that DC-DC chip can always work under higher transfer efficiency, and then by reducing DC-DC
The energy loss of chip, to further decrease the total power consumption of system.
Preferably, as output electric current I < I of the main DC-DC chipLAnd all secondary DC-DC chips are protected when being turned off
The operating status of the main DC-DC chip is held, electronic equipment is maintained to operate normally.
Preferably, as output electric current I > I of the main DC-DC chipHAnd all secondary DC-DC chips are in operation shape
When state, controls the main DC-DC chip and all secondary DC-DC chips are closed, power supply circuit is made to enter guard mode, to avoid
The fever of DC-DC chip is serious, influences the safety of system operation.
In order to which the DC-DC chip for making each put into operation can work near its maximum conversion efficiency, the main DC-
DC chip and all secondary DC-DC chips preferably have corresponding between same or similar energy conversion efficiency and output electric current
Relationship.
In order to realize effective control of the control unit to the working condition of secondary DC-DC chip, present invention preferably employs following
Two kinds of control programs:
One is by the enable end of described control unit auxiliary connection DC-DC chip, by making to secondary DC-DC chip
It can control, to change the working condition of secondary DC-DC chip；
The second is being separately connected all the way in the connection line of each described secondary DC-DC chip and DC input voitage
Switch, described control unit is by controlling each way switch on-off, to change the working condition of each secondary DC-DC chip.
On the other hand, the invention also provides a kind of electronic equipment, including DC-DC chip, current detecting unit and
Control unit；The DC-DC chip receives DC input voitage, and DC output voltage needed for converting output loading；It is described
DC-DC chip includes multiple and parallel with one another, a respectively main DC-DC chip and at least one secondary DC-DC chip, the master
DC-DC chip is run upon power-up of the system；The current detecting unit detects the output electric current I of the main DC-DC chip；It is described
Control unit carries out control as follows according to working condition of the output electric current I to secondary DC-DC chip: starting in system and runs
Afterwards, all secondary DC-DC chips are controlled first to close；Work as I > IHWhen, control secondary DC-DC chip is run one by one, until IL<I<IH；
As I < ILAnd when having the operation of secondary DC-DC chip, controls secondary DC-DC chip in operating status and close one by one, until IL<I<IH；
Wherein, ILFor low current threshold value, IHFor high current threshold value, and IL<IO<IH, IOIt is converted for DC-DC chip operation in its maximum power
Output current value when efficiency M.
Compared with prior art, the advantages and positive effects of the present invention are: the present invention is using multiple DC-DC chips parallel connections
Mode designs power supply circuit, and can automatically select one or more DC-DC chips according to the size of system power and put into operation,
The convert task of direct-current input power supplying is completed, it is possible thereby to when system power is larger, it is multiple by sharing system power
On DC-DC chip, to reduce the load of single DC-DC chip, avoid DC-DC chip because working long hours in high current
Caused by generate heat, can not only reduce the calorific value of DC-DC chip, but also the working life of DC-DC chip can be extended, mention
The safety and reliability of high circuit system operation.In addition, by reasonably selecting low current threshold value ILWith high current threshold value IH,
The energy conversion efficiency of DC-DC chip can be made to be maintained near its maximum conversion efficiency as far as possible, then by reducing DC-DC core
The energy loss of piece reaches the purpose of design for reducing total system power consumption.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, for this field
For those of ordinary skill, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of schematic block circuit diagram of embodiment of low-power consumption power supply circuit proposed by the invention；
Fig. 2 is the schematic block circuit diagram of another embodiment of low-power consumption power supply circuit proposed by the invention；
Fig. 3 is that the energy conversion efficiency of the DC-DC chip of certain model exports the of different sizes of electric current with it and changes
Graph of relation；
Fig. 4 is control flow chart of the main control unit in Fig. 1, Fig. 2 to DC-DC chip.
Specific embodiment
A specific embodiment of the invention is described in more detail with reference to the accompanying drawing.
The present embodiment is in order to realize low power dissipation design to power supply circuit, using multiple DC-DC chips to direct-current input power supplying
Conversion process is carried out, when system power is smaller, a DC-DC chip can be used by DC input voitage and be converted into load institute
The DC output voltage needed is load supplying；And when system power is larger, it is carried out simultaneously by using multiple DC-DC chips
Power supply conversion, is jointly load supplying, so as to reduce the electric current shared on each DC-DC chip, reduces each
The calorific value of DC-DC chip reaches the design for reducing power supply circuit power consumption by improving the energy conversion efficiency of DC-DC chip
Purpose.
As shown in Figure 1 and Figure 2, the present embodiment is provided with a main DC-DC chip in power supply circuit and at least one is secondary
DC-DC chip.By all DC-DC chips it is parallel with one another after, be connected to power interface and load between.The power supply of the present embodiment
Interface indicates that the terminal or node for accessing direct-current input power supplying, the direct-current input power supplying can be by the inside of electronic equipment
Battery provides, and can also be provided by the external power supply adaptor of electronic equipment, can also be as the AC-DC mould built in electronic equipment
For block to what is generated after electric main rectifying conversion, the present embodiment is not limited to the above citing to the source of direct-current input power supplying.Configuration
Each DC-DC chip, which is performed both by runtime from DC input voitage Vi n DC output voltage Vout to needed for loading, to be turned
Change process.In power supply circuit, setting current detecting unit connects main DC-DC chip and exports the DC output voltage Vout's
Terminal for acquiring the output electric current I of main DC-DC chip, and generates the master that corresponding detection signal is sent in load
Unit is controlled, to realize main control unit to the real-time monitoring of the output electric current I of main DC-DC chip.Turned according to the electric energy of DC-DC chip
Characteristic is changed, predefines two current threshold ILAnd IH, wherein ILFor low current threshold value, IHFor high current threshold value, and respectively
It is written in main control unit.In actual use, control unit passes through the output electric current I of main DC-DC chip and two
Current threshold ILAnd IHIt is compared, cooperates main DC-DC chip to be negative jointly to judge whether to need to start secondary DC-DC chip
Power supply is carried, and auto-changeover control is carried out to the working condition of each secondary DC-DC chip.
The energy conversion efficiency of DC-DC chip is changed with the variation of the output electric current of DC-DC chip, and Fig. 3 shows
The energy conversion efficiency for having gone out the DC-DC chip of a certain model exports the graph of relation of curent change with it.In figure, the longitudinal axis
Indicate the transfer efficiency of DC-DC chip；The output electric current of horizontal axis expression DC-DC chip；The curve of different patterns indicates DC-DC core
Piece is in different input voltage VINWith output voltage VOUTIn the case where, the corresponding relationship between transfer efficiency and output electric current.
With input voltage VINFor 12V, output voltage VOUTTo be illustrated for the curve (dashed middle line) of 3.3V.Fig. 3
In, being located in the middle dotted line is an intermediate curve high, both sides are low, when the output electric current of DC-DC chip is 1.2A, conversion
Efficiency is 93%, reaches maximum value；When the output electric current of DC-DC chip is less than 1.2A, transfer efficiency is with output electric current
Reduction and reduce；When the output electric current of DC-DC chip is greater than 1.2A, transfer efficiency subtracts with the increase of output electric current
It is small.
For the power supply circuit of the present embodiment, the low current threshold value I is being determinedLWith high current threshold value IHWhen, it can use
Mode identified below:
Firstly, being preferably selected the DC-DC core of same model when selecting the model of main DC-DC chip and secondary DC-DC chip
Piece；Even if not selecting the DC-DC chip of same model, it should also select that there is identical or similar energy conversion efficiency and output
The DC-DC chip of corresponding relationship between electric current, to guarantee that the DC-DC chip that each puts into operation can work as much as possible
Near its maximum conversion efficiency；
Secondly, being searched according to DC output voltage Vout needed for the DC input voitage Vin of power supply circuit and load
The corresponding relationship of energy conversion efficiency and output electric current of the DC-DC chip in the input voltage and output voltage is bent out
Line, and then output current value of the DC-DC chip in its maximum power transfer efficiency M is determined according to the corresponding relationship curve
IO；
Then, it is greater than I in output electric currentOAnd in section of the energy conversion efficiency greater than M-2%, a current value is selected to make
For the high current threshold value IH, and meet IO<IH<2IOCondition；
Finally, being less than I in output electric currentOAnd in section of the energy conversion efficiency greater than M-10%, a current value is selected
As the low current threshold value IL, and meetCondition.
It is illustrated for the DC-DC chip of the model shown in Fig. 3.Assuming that the DC input voitage Vin=of power supply circuit
DC output voltage Vout=3.3V needed for 12V, load, then the dotted line in Fig. 3 be DC-DC chip the input voltage with
The corresponding relationship curve of energy conversion efficiency and output electric current in the case of output voltage.For the corresponding relationship curve, first
Determine maximum power the transfer efficiency M=93%, corresponding output current value I of DC-DC chipO=1.2A；Then, it selects
The current value 2A that output electric current is greater than 1.2A and energy conversion efficiency is 92% is as high current threshold value, that is, IH=2A, meets IO<
IH<2IOCondition；Select output electric current be less than 1.2A and energy conversion efficiency for 89% current value 0.5A as low current threshold
Value, that is, IL=0.5A meetsCondition.
As seen from Figure 3, it is located at IOTransfer efficiency corresponding to the current value of two sides is not with maximum conversion effect in Fig. 3
Symmetric points centered on rate M, because transfer efficiency is in the case where variation 1%, output current value is bigger, and energy loss is got over
Greatly.Therefore, high current threshold value I is setHWhen, it should select compared to low current threshold value ILFor corresponding energy conversion efficiency point,
Output current value corresponding to energy conversion efficiency point closer to maximum conversion efficiency M.In this way in the output electricity of DC-DC chip
It flows I and is lower than IOWhen, it can keep the transfer efficiency of DC-DC chip between 85%-93%；And in the output of DC-DC chip electricity
It flows I and is higher than IOWhen, transfer efficiency can maintain between 92%-93%, it is possible thereby to guarantee that DC-DC chip being capable of work always
Make near its maximum conversion efficiency, to be reduced as far as the energy loss of DC-DC chip, thus reaches reduction system total work
The purpose of consumption.
The low current threshold value I that will be determinedLWith high current threshold value IHIt is written in main control unit and is saved, actually answered
With in the process, main control unit can automatically control in power supply circuit according to the real-time change of the output electric current I of main DC-DC chip
1~n of each secondary DC-DC chip switch its working condition.
Below with reference to Fig. 4, the control process of main control unit is specifically addressed.Including following procedure:
S401, upon power-up of the system, main DC-DC chip starting operation, is converted into direct current output for DC input voitage Vin
Voltage Vout is control unit and other load supplyings.
S402, control unit control the pass that all 1~n of secondary DC-DC chip keep it to default after upper electricity operation first
Closed state.
S403, main control unit receive the detection signal of current detecting unit output, and parsing obtains the output of main DC-DC chip
Electric current I.
S404, I > I is detected when main control unitHWhen, control secondary DC-DC chip is run one by one, until IL<I<IH, returned
Journey S403 continues to monitor the output electric current I of main DC-DC chip；
In the present embodiment, main control unit is in the output electric current I > I for detecting main DC-DC chipHWhen, one is controlled first
Secondary DC-DC chip 1 is run, and is jointly load supplying using two DC-DC chips；At this point, being split on two DC-DC chips
Exporting electric current is respectivelyIfIt then indicates that one secondary DC-DC chip 1 of control is only needed to cooperate main DC-DC chip
Operation can meet job requirement, and 2~n of other secondary DC-DC chips is remained off.IfIt then needs to control one again
A secondary DC-DC chip 2 is run, and is jointly load supplying using three DC-DC chips；At this point, being split on three DC-DC chips
Output electric current be respectivelyIfThen indicate that needing to control two secondary DC-DC chips 1,2 cooperates main DC-DC
Chip operation is just able to satisfy job requirement, and 3~n of other secondary DC-DC chips can be remained off.And so on, using control
The mode that n secondary DC-DC chip processed is run one by one, until the output electric current of main DC-DC chip meets IL<I<IHUntil.
In actual application, the output electric current I of main DC-DC chip is usually to gradually rise.It is transported in system electrification
After row, the output electric current I of main DC-DC chip is initially less than ILOr between IL~IHBetween, at this point, merely with main DC-DC chip
For load supplying.Quantity with lengthening or the load to put into operation of system operation time gradually increases, main DC-DC
The output electric current I of chip may be stepped up.When main control unit detects output electric current I > I of main DC-DC chipHWhen, it stands
It controls a secondary DC-DC chip 1 to run, the output electric current I of main DC-DC chip is reduced to IHBelow.It is low due to setting
Current thresholdTherefore, the output electric current I of main DC-DC chip meets IL<I<IHCondition.When main DC-DC chip
Output electric current I continues to increase, and exceeds I againHWhen, increase a secondary DC-DC chip 2 and put into operation state, at this point, main DC-DC
The output electric current I of chip will come back to IL~IHBetween.And so on, it is transported one by one by controlling n 1~n of secondary DC-DC chip
Row, until the output electric current I of main DC-DC chip meets IL<I<IHUntil.
After all 1~n of secondary DC-DC chip put into operation, if detecting the output electric current I of main DC-DC chip again
Have exceeded high current threshold value IH, then in terms of circuit system operational safety the considerations of, the present embodiment preferably controls main DC-DC core
Piece and 1~n of all secondary DC-DC chip are all closed, and circuit system is made to enter protected mode, avoid generating heat because of DC-DC chip
Safety and reliability that is serious and influencing circuit system operation.
S405, I < I is detected when main control unitLWhen, control secondary DC-DC chip is closed one by one, until IL<I<IHOr institute
When the secondary DC-DC chip having is turned off, return course S403 continues to monitor the output electric current I of main DC-DC chip；
When main control unit detects output electric current I < I of main DC-DC chipLWhen, in order to make the transfer efficiency of DC-DC chip
Can maintain near maximum conversion efficiency as far as possible, the present embodiment using control 1~n of secondary DC-DC chip close one by one by the way of,
The output electric current I of main DC-DC chip is gradually increased, until meeting IL<I<IHUntil.
After all secondary DC-DC chips are all closed, if the output electric current I of main DC-DC chip is still less than setting
Low current threshold value IL, then the operating status of main DC-DC chip is kept, is load supplying merely with main DC-DC chip.Though at this point,
The energy conversion efficiency of right power supply circuit is not high, but can guarantee that circuit system can continue, safely run, and meets electronics
The demand of equipment continuous use.
In order to realize main control unit to the auto-changeover control of the working condition of each DC-DC chip, the present embodiment is proposed
The preferred control mode of following two:
Mode one, enabled control mode
As shown in Figure 1, enabled control mode can be used for there is the DC-DC chip of enabled control terminal EN,
By carrying out making can control to DC-DC chip, to change the working condition of DC-DC chip.It, can be with as a kind of preferred embodiment
It selects the road the n I/O port of main control unit to export the road n enable signal, is transmitted to n 1~n's of secondary DC-DC chip correspondingly respectively
Enabled terminal EN.When needing to control the closing of some secondary DC-DC chip, main control unit is invalid to secondary DC-DC chip output
Enable signal (such as low level signal), control the secondary DC-DC chip and stop enabled, be in close state；Conversely, when needing to control
When making the operation of some secondary DC-DC chip, main control unit exports effective enable signal (such as high level to the secondary DC-DC chip
Signal), it controls the secondary DC-DC chip and enables, into operating status.
For main DC-DC chip, it can use DC input voitage Vin and it carried out making can control, such as high electricity
For putting down enabled main DC-DC chip, the enabled terminal of main DC-DC chip can be connected to power interface, in system electrification
When, DC input voitage Vin is set up, and the enabled operation of main DC-DC chip provides its work for main control unit and other loads
DC output voltage Vout needed for making.When needing to control the closing of main DC-DC chip, the control of main control unit output can use
Signal processed drags down the current potential on the enabled terminal of main DC-DC chip, is closed with controlling main DC-DC chip.
Mode two, switch control mode
As shown in Fig. 2, one can be separately connected on the route that each DC-DC chip receives DC input voitage Vin
A switch, by controlling each way switch on-off, to change the working condition of DC-DC chip.It, can be with as a kind of preferred embodiment
It selects a normally closed switch K0 to be connected to the input terminal of main DC-DC chip, n normal open switch K1~Kn is selected to be connected to n
The input terminal of 1~n of a secondary DC-DC chip.Signal is controlled using main control unit output n+1 way switch, to the normally closed switch K0
On-off control is carried out with n normal open switch K1~Kn.For example, in system electrification, normally closed switch K0 closure, normal open switch K1~
Kn is disconnected, and makes electricity operation on main DC-DC chip, and n 1~n of secondary DC-DC chip is closed.When needing to control some secondary DC-DC core
When piece is run, main control unit control connects the normal open switch closure of the secondary DC-DC chip, controls the secondary DC-DC chip and powers on, into
Enter operating status.When needing to control the closing of main DC-DC chip, main control unit controls the normally closed switch K0 and disconnects, control master
DC-DC powering down chips, it is out of service.
It is of course also possible to use other control methods switch over control, the present embodiment to the working condition of DC-DC chip
It is not limited in the above citing.
The low-power consumption power supply circuit of the present embodiment is mainly used in using battery power supply and more demanding to system power dissipation
In electronic equipment, such as the terminal devices such as mobile phone, smartwatch, intelligent glasses.It is of course also possible to be applied to other any need
In the electronic equipment for reducing system power dissipation.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of low-power consumption power supply circuit characterized by comprising
DC-DC chip receives DC input voitage, and DC output voltage needed for converting output loading；The DC-DC core
Piece includes multiple and parallel with one another, a respectively main DC-DC chip and at least one secondary DC-DC chip, the main DC-DC core
Piece is run upon power-up of the system；
Current detecting unit detects the output electric current I of the main DC-DC chip；
Control unit carries out control as follows according to working condition of the output electric current I to secondary DC-DC chip:
After system starting operation, all secondary DC-DC chips are controlled first and are closed；
Work as I > IHWhen, control secondary DC-DC chip is run one by one, until IL<I<IH；
As I < ILAnd when having the operation of secondary DC-DC chip, controls secondary DC-DC chip in operating status and close one by one, until IL<I
<IH；
Wherein, ILFor low current threshold value, IHFor high current threshold value, and IL<IO<IH, IOIt is DC-DC chip operation in its maximum power
Output current value when transfer efficiency M.
2. low-power consumption power supply circuit according to claim 1, which is characterized in that the output electric current of the DC-DC chip is IH
When, the energy conversion efficiency of DC-DC chip is greater than M-2%, and IO<IH<2IO。
3. low-power consumption power supply circuit according to claim 2, which is characterized in that the low current threshold value。
4. low-power consumption power supply circuit according to claim 3, which is characterized in that the output electric current of the DC-DC chip is IL
When, the energy conversion efficiency of DC-DC chip is greater than M-10%.
5. low-power consumption power supply circuit according to claim 1, which is characterized in that when the output electricity of the main DC-DC chip
Flow I < ILAnd all secondary DC-DC chips keep the operating status of the main DC-DC chip when being turned off.
6. low-power consumption power supply circuit according to claim 1, which is characterized in that when the output electricity of the main DC-DC chip
Flow I > IHAnd all secondary DC-DC chips control the main DC-DC chip and all secondary DC-DC when being in operating status
Chip is closed, and power supply circuit is made to enter guard mode.
7. low-power consumption power supply circuit according to any one of claim 1 to 6, which is characterized in that the main DC-DC chip
And all secondary DC-DC chips have the corresponding relationship between same or similar energy conversion efficiency and output electric current.
8. low-power consumption power supply circuit according to any one of claim 1 to 6, which is characterized in that described control unit connects
The enable end for connecing secondary DC-DC chip, by carrying out making can control to secondary DC-DC chip, to change the work shape of secondary DC-DC chip
State.
9. low-power consumption power supply circuit according to any one of claim 1 to 6, which is characterized in that in each pair
A switch is connected separately in the connection line of DC-DC chip and DC input voitage, described control unit is by controlling each road
Switch on and off, to change the working condition of each secondary DC-DC chip.
10. a kind of electronic equipment, which is characterized in that power including low-power consumption as claimed in any one of claims 1-9 wherein electric
Road.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114461285A (en) * | 2022-01-20 | 2022-05-10 | 深圳市宝尔爱迪科技有限公司 | Multi-chip driving method, device and equipment and computer readable storage medium |
| CN115802464A (en) * | 2023-02-14 | 2023-03-14 | 中国电子科技集团公司第十五研究所 | Internet of things terminal low-power consumption control device based on carrier sensing |
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| CN110289758B (en) | 2021-06-04 |
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