CN110323736A - Power supply switch circuit and electronic equipment - Google Patents
Power supply switch circuit and electronic equipment Download PDFInfo
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- CN110323736A CN110323736A CN201910743748.3A CN201910743748A CN110323736A CN 110323736 A CN110323736 A CN 110323736A CN 201910743748 A CN201910743748 A CN 201910743748A CN 110323736 A CN110323736 A CN 110323736A
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- power supply
- conversion circuit
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 93
- 239000004065 semiconductor Substances 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004826 seaming Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
- H02J1/102—Parallel operation of DC sources being switching converters
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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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
It includes: DC-DC conversion circuit, electronic switching circuit and low pressure difference linear voltage regulator that the present invention, which provides a kind of power supply switch circuit and electronic equipment, the power supply switch circuit,；The input terminal of the input terminal connection low pressure difference linear voltage regulator of DC-DC conversion circuit, the input terminal of DC-DC conversion circuit is for connecting DC power supply；The input terminal of the output end connection electronic switching circuit of DC-DC conversion circuit；The output end of the output end connection low pressure difference linear voltage regulator of electronic switching circuit, the output end of electronic switching circuit are greater than the maximum output voltage of low pressure difference linear voltage regulator for connecting load, the output voltage of DC-DC conversion circuit.The present invention, for load supplying, improves the overall efficiency etc. of system power supply using the parallel-connection structure of low pressure difference linear voltage regulator and DC-DC conversion circuit and according to the light condition of load and non-light condition come seamless switching low pressure difference linear voltage regulator and DC-DC conversion circuit.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of power supply switch circuits and electronic equipment.
Background technique
Essentially all of electronic product requires power supply supply, it may be said that power supply is the necessary composition portion of electronic product
Point.The control panel power supply of various electronic circuit is substantially direct current supply, such as by the 12V/24V of the rectified output of AC power source
DC power supply, or using battery power supply mode etc..Currently, the direct-current input power supplying of electronics board on the market is usually to adopt
The buck or boost that direct-current input power supplying is realized with DC-DC conversion circuit or low pressure difference linear voltage regulator (LDO), respectively as schemed
Shown in 1A and Figure 1B, then it is powered again to each chip and module that load on control panel.
For electronic product, the power-efficient parameter of control panel is the important finger of a judge power supply comprehensive performance
Mark, it is more outstanding using battery powered low-power consumption product especially for product stand-by power consumption, the higher product of efficiency class requirement
It is important.However, for the power supply topologies of such as Figure 1A and Figure 1B, since different voltage conversion circuits is loading different shapes
Different losses under state, system power supply whole efficiency be not high.
Summary of the invention
In view of this, the present invention provides a kind of power supply switch circuit and electronic equipment, the power supply switch circuit is by will be low
Pressure difference linear voltage regulator and DC-DC conversion circuit are connected in parallel, and realize seamless switching according to the different conditions of load,
The overall efficiency etc. of system power supply can be improved.
The embodiment of the present invention provides a kind of power supply switch circuit, comprising: DC-DC conversion circuit, electronic switching circuit and low
The input terminal of pressure difference linear voltage regulator, the DC-DC conversion circuit connects the input terminal of the low pressure difference linear voltage regulator, described
The input terminal of DC-DC conversion circuit is for connecting DC power supply；
The output end of the DC-DC conversion circuit connects the input terminal of the electronic switching circuit, the DC-DC conversion electricity
The enable end on road and the enable end of the electronic switching circuit are used to connection control terminal；
The output end of the electronic switching circuit connects the output end of the low pressure difference linear voltage regulator, the electronic switch
The output end of circuit is for connecting load, wherein it is steady that the output voltage of the DC-DC conversion circuit is greater than the low pressure difference linearity
The maximum output voltage of depressor；
The control terminal, which is used to work as, to be loaded to start, the DC-DC conversion circuit under non-light condition and making the electricity
Sub switch circuit is connected, so that the DC-DC conversion circuit is the load supplying；
The control terminal is also used to described to start the DC-DC conversion circuit not and making when loading
Electronic switching circuit disconnects, so that the low pressure difference linear voltage regulator is the load supplying.
Further, in above-mentioned power supply switch circuit, further includes: as the power management chip of the control terminal,
The enable end of the DC-DC conversion circuit and the enable end of the electronic switching circuit are all connected with the power management chip.
Further, in above-mentioned power supply switch circuit, the control terminal is the main control chip of the load, described
The enable end of DC-DC conversion circuit is used to connect the main control chip with the enable end of the electronic switching circuit.
Further, in above-mentioned power supply switch circuit, the electronic switching circuit includes electronic switch, the electronics
Switch is triode, metal-oxide-semiconductor or relay.
Further, in above-mentioned power supply switch circuit, when the electronic switch is metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor
Pole connects the output end of the DC-DC conversion circuit for connecting the control terminal, source electrode, drains for connecting the load.
Further, in above-mentioned power supply switch circuit, further includes: AC-DC adapter, the AC-DC adapter
For input terminal for connecting AC power source, output end connects the input terminal of the DC-DC conversion circuit；
The AC-DC adapter inputs the DC-DC conversion electricity after being used to be converted to the AC power source DC power supply
Road and the low pressure difference linear voltage regulator.
Further, in above-mentioned power supply switch circuit, further includes: for connecting the battery terminal of battery, the electricity
Pond terminal connects the input terminal of the DC-DC conversion circuit.
Further, in above-mentioned power supply switch circuit, further includes: the battery being connect with the battery terminal, it is described
Battery is dry cell or battery.
Another embodiment of the present invention also proposes a kind of electronic equipment, including above-mentioned power supply switch circuit.
Further, in above-mentioned electronic equipment, the electronic equipment is intelligent door lock or intelligent doorbell.
The technical solution of the embodiment of the present invention is by the way that DC-DC conversion circuit and low pressure difference linear voltage regulator to be connected in parallel
Load end, and seamless switching is carried out according to the different conditions of load, the overall efficiency etc. of system power supply can be improved.And pass through increase
One electronic switching circuit can effectively realize the isolation of DC-DC conversion circuit and low pressure difference linear voltage regulator, and the two is avoided to exist
Influencing each other in handoff procedure, to ensure that the reliability etc. of the power supply switch circuit.
For enable the above objects, features and advantages of the present invention become apparent from it is understandable, preferred embodiment is cited below particularly, and match
Appended attached drawing is closed, is described below in detail.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Figure 1A and Figure 1B respectively illustrates the structural schematic diagram of existing power-supplying circuit；
Fig. 2 shows the first structure diagrams of the power supply switch circuit of the embodiment of the present invention；
Fig. 3 shows the second structural schematic diagram of the power supply switch circuit of the embodiment of the present invention；
Fig. 4 shows the third structural schematic diagram of the power supply switch circuit of the embodiment of the present invention.
Main element symbol description:
100- power supply switch circuit；10-DC-DC conversion circuit；20- electronic switching circuit；30- low pressure difference linearity pressure stabilizing
Device；40- power management chip；50-AC-DC adapter.
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 considered as limiting the invention.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element is referred to as " directly existing " another element "upper",
There is no intermediary elements.Term as used herein "vertical", "horizontal", "left" and "right" and similar statement are
For illustrative purposes.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.It is specific that description is intended merely in the term used in the description of template herein
Embodiment purpose, it is not intended that limitation the present invention.Term " and or " used herein includes one or more relevant
Any and all combinations of listed item.
As shown in Figure 1A, in this scenario, direct-current input power supplying is exported by DC-DC conversion circuit and is supplied to load
Electricity, normally, the enable end EN1 of the DC-DC conversion circuit are essentially high level, i.e., connect with direct-flow input end, as long as in this way
One powers on, which can enter working condition.Certainly, enable end EN1 can also be controlled individually.
It is under light condition when loading, the transfer efficiency of DC-DC conversion circuit is lower, normally, in the output of 10uA for the program
Its power supply conversion efficiency is below 20% under electric current.In fact, for some low power consuming devices products, such as Internet of Things Intelligent hardware
Product, the master control IC most of the time, normal power supply mode can just be entered by being only waken up all in dormant state, and for this
When standby consumption electric current can reach a microampere rank.As it can be seen that the transfer efficiency of the DC-DC conversion circuit is very in the standby state
Low, this will substantially reduce the whole efficiency of system power supply.
As shown in Figure 1B, in the program, direct-current input power supplying is by low pressure difference linear voltage regulator (i.e. LDO) output to load
It is powered, normally, which does not have enable end, and when power supply, which meets LDO, normally to be started, LDO can be worked normally, defeated
Target voltage out.Wherein, the output of LDO own loss very little in the case where load is idle or turns off.But when LDO is just
Under normal operating mode, as 10mA or more output electric current when, own loss is larger, and power supply conversion efficiency turns compared to DC-DC
Changing circuit will substantially reduce.After equipment switchs to normal mode of operation, load current will be higher by very much, even with respect to standby mode
Can be at 1000 times or more, therefore the power-efficient under its normal mode of operation is equally very important.
Based on this, the present invention proposes a kind of power supply switch circuit, to realize that optimization system power supply structure goes raising system electric
The overall efficiency in source.It should be appreciated that the standby mode of equipment, dormant state, off-state are collectively termed as being lightly loaded shape in the present invention
State.It is appreciated that under light condition, the power very little of power supply needed for loading or be zero, equipment is in the shape of low-power consumption at this time
State.Conversely, non-light condition may include normal operating conditions and heavy condition of load etc..For example, if equipment is by external thing
After part wakes up, then normal operating conditions will be switched to by dormant state, then equipment master control will work under full range.It is set with door lock
For standby, if receiving door open command, door lock master control will also driving motor work, Transient Load Current can be very big at this time, can
It is considered as above-mentioned heavy condition.
Embodiment 1
Referring to figure 2., the present embodiment proposes a kind of power supply switch circuit 100, can be applied to all kinds of include power supply device
In electronic equipment, such as intelligent door lock, intelligent doorbell.Entire electronic equipment can be improved by the power supply switch circuit 100
Overall efficiency etc..The power supply switch circuit 100 is described in detail below.
As shown in Fig. 2, the power supply switch circuit 100 includes DC-DC conversion circuit 10, electronic switching circuit 20 and low voltage difference
Linear voltage regulator 30.Exemplarily, the input terminal of DC-DC conversion circuit 10 connects the input of the low pressure difference linear voltage regulator 30
End, the input terminal of DC-DC conversion circuit 10 is for connecting DC power supply, i.e. DC-DC conversion circuit 10 and low pressure difference linearity pressure stabilizing
Device 30 is connected in parallel in same DC power supply.The output end of the DC-DC conversion circuit 10 connects the defeated of the electronic switching circuit 20
Enter end, electronic switching circuit 20 output end connection low pressure difference linear voltage regulator 30 output end, electronic switching circuit 20 it is defeated
Outlet is for connecting load, i.e., DC-DC conversion circuit 10 is in parallel with low pressure difference linear voltage regulator 30 after electronic switching circuit
It is connected to same load.
In the present embodiment, the output voltage that the DC-DC conversion circuit 10 is arranged is greater than the low pressure difference linear voltage regulator 30
Maximum output voltage.Exemplarily, as shown in Fig. 2, the output voltage Vout1 of settable DC-DC conversion circuit 10 is slightly larger than low
The maximum output voltage Vout2 of pressure difference linear voltage regulator 30, for example, settable be greater than 0.1V or so.Since load supplying is usual
There are certain voltage ranges, therefore need to only guarantee Vout1 and Vout2 in its voltage range.
In the present embodiment, the enable end of the DC-DC conversion circuit 10 and the enable end of electronic switching circuit 20 are used to connect
Connect a control terminal.Exemplarily, which can be the power management chip for being exclusively used in power management, wherein the power supply pipe
Reason chip can be used in the working condition of the load of monitoring connection.Certainly, which is also possible to the master control of the load of connection
Chip etc..
Specifically, which will be used to when the load connected be to enable the DC-DC conversion circuit under non-light condition
10 and the electronic switching circuit 20, even if the starting of DC-DC conversion circuit 10 and electronic switching circuit 20 is connected, so that should
DC-DC conversion circuit 10 is the load supplying after capable of carrying out voltage conversion to the DC power supply of access.
The control terminal is also used to when the load of connection be to start DC-DC conversion circuit 10 not under light condition and make electricity
Sub switch circuit 20 disconnects, so that the DC power supply of 30 pairs of low pressure difference linear voltage regulator accesses is born after carrying out voltage conversion for this
Carry power supply.
In the present embodiment, which is mainly used for realizing that DC-DC conversion circuit 10 and low pressure difference linearity are steady
The isolation of depressor 30.Exemplarily, the electronic switching circuit 20 include electronic switch, for example, the electronic switch can for triode,
Metal-oxide-semiconductor or relay etc..Wherein, triode includes NPN pipe again and PNP pipe, metal-oxide-semiconductor include P-channel metal-oxide-semiconductor and N-channel MOS again
Pipe etc..
For example, if the electronic switch is P-channel metal-oxide-semiconductor, as shown in figure 3, the grid of the P-channel metal-oxide-semiconductor is made for connecting
For the power management chip of control terminal, source electrode connects the output end of the DC-DC conversion circuit 10, and drain electrode is described negative for connecting
It carries.Certainly, also settable corresponding current-limiting resistance between the grid of the P-channel metal-oxide-semiconductor and power management chip, specifically can basis
Actual demand setting.
Normally, in DC-DC conversion circuit 10, as Boost circuit, BUCK reduction voltage circuit or Boost-Buck are gone up and down
Volt circuit etc. can include a relatively large storage capacitor, and when DC-DC conversion circuit 10 is after closing, which can be into
Row electric discharge.Quick discharging circuit is carried inside some DC-DC conversion circuits 10, that is, storage capacitor is allowed to discharge rapidly when closed.
If DC-DC conversion circuit 10 and LDO are connection relationships directly in parallel, i.e., not over the electronic switching circuit 20 progress every
From, at this time after switching to LDO and being powered, then the output voltage of LDO will largely be absorbed by the discharge circuit, thus
System power dissipation is increased, so also just it is unable to reach the efficient purpose of underloading.Therefore, pass through the setting of the electronic switching circuit 20
It can be effectively isolated 10 influencing each other in handoff procedure of LDO and DC-DC conversion circuit, not only ensure that circuit reliability,
The efficient realization being also conducive under light condition simultaneously, to improve the overall efficiency of system power supply.
Optionally, as shown in figure 4, the power supply switch circuit 100 further includes power management chip 40, the power management chip
40, as above-mentioned control terminal, are accordingly controlled for the enable end to DC-DC conversion circuit 10 and electronic switching circuit 20.
Exemplarily, the enable end of DC-DC conversion circuit 10 and the enable end of electronic switching circuit 20 are all connected with the power management chip
40。
Since the control having the same of the enable end of DC-DC conversion circuit 10 and the enable end of electronic switching circuit 20 is patrolled
Volume, it is preferable that the power supply is connected to after the enable end of the DC-DC conversion circuit 10 is in parallel with the enable end of electronic switching circuit 20
Managing chip 40, i.e. two enable ends share a control pin of the power management chip 40, to reduce to chip pin
Occupy etc..
As another optional scheme, above-mentioned control terminal be the main control chip loaded, i.e., using main control chip come pair
The enable end of DC-DC conversion circuit 10 and electronic switching circuit 20 is controlled.Exemplarily, DC-DC conversion circuit 10 makes
Energy end is used to connect the main control chip of load with the enable end of electronic switching circuit 20.Alternatively, the enable end parallel connection of the two connects
It is connected to the same control pin of the main control chip.
Optionally, which further includes AC-DC adapter 50, and the input terminal of the AC-DC adapter 50 is used
In connection AC power source, output end connects the input terminal of the DC-DC conversion circuit 10.The AC-DC adapter 50 will be for that will connect
The AC power source connect is separately input in DC-DC conversion circuit 10 and low pressure difference linear voltage regulator 30 after being converted to DC power supply.
It is appreciated that the AC-DC adapter 50 is mainly used for the AC power source to access, such as AC110V~220V carries out pressure drop, whole
The processing such as stream and filtering.
As another optional scheme, which further includes the battery terminal for connecting battery, should
Battery terminal connects the input terminal of the DC-DC conversion circuit 10 and the input terminal of low pressure difference linear voltage regulator 30.Optionally, the electricity
Source switching circuit 100 further includes the battery connecting with above-mentioned battery terminal, which will be as DC supply input to DC-DC
Conversion circuit 10 and low pressure difference linear voltage regulator 30.Exemplarily, which can be used dry cell or battery etc., specific such as lithium
Battery, AA/AAA battery etc..
Exemplarily, in conjunction with Fig. 2, the working principle of the power supply switch circuit 100 is illustrated below.
It (1) is light condition when loading, such as standby mode, dormant state, control terminal will make DC-DC conversion circuit 10 not
Starting, i.e., do not work, and make 20 off-state of electronic switching circuit, such as specifically can be equal by setting enable end EN1 and EN2
For low level, the LDO output voltage load that is negative is powered at this time.
It is appreciated that electric current needed for loading at this time is 0 or very small electric current when load is light condition, such as receive
Peace rank or milliampere rank hereinafter, and LDO consumption at this time is itself quiescent current, the quiescent current is extremely low, therefore be lost
Very little, to ensure that the high efficiency of system power supply.
(2) when load switchs to non-light condition, such as normal operating conditions, control terminal is by enabled DC-DC conversion circuit
10 and electronic switching circuit 20, i.e., starting DC-DC conversion circuit 10 and electronic switching circuit 20 is connected, it such as specifically can be by setting
Setting enable end EN1 and EN2 is high level, and the output voltage Vout1 of DC-DC conversion circuit 10 passes through electronic switching circuit at this time
The load that is negative after 20 is powered.
As shown in Fig. 2, ignore the conduction loss of electronic switch in electronic switching circuit 20, DC-DC conversion circuit 10 at this time
Output voltage Vout1 is approximately equal to the output voltage Vout1_1 of electronic switching circuit 20, i.e. Vout1 ≈ Vout1_1 > LDO most
Big output voltage Vout2.Since the output voltage Vout1 of DC-DC conversion circuit 10 can be less than the direct current of its input terminal access
Source voltage, therefore LDO is not in that electric current flows backward phenomenon, output voltage relies on load current to adjust.If the output voltage of LDO
Connected load is drawn high to maximum output voltage Vout2, and due to being provided with Vout1 > Vout2, therefore LDO will not enter work
State.It is appreciated that only having DC-DC conversion circuit 10 to be negative at this time is loaded into the power supply of row high efficiency.
(3) when load switchs to light condition again, it is low level that control terminal, which is once again set up enable end EN1 and EN2, is
System will be re-converted into LDO output.
Then, repeatedly according to the state change of load, realization DC-DC conversion circuit 10 is with LDO power supply without seaming and cutting
It changes, compared to existing two kinds of power supply power supply schemes, improves the overall efficiency of system power supply.
Compared to the existing scheme of such as Figure 1A, the power supply switch circuit 100 of the present embodiment can also effectively prevent DC-DC to convert
The electromagnetic interference problem of circuit 10.This is because for the scheme of such as Figure 1A, in order to reach the efficient purpose of underloading, DC-DC conversion
Circuit 10 would generally reduce the working frequency of internal switch under light condition.Due to load by underloading to non-light condition or
The variation that can cause working frequency to the transformation of light condition by non-underloading, in addition, DC-DC conversion circuit 10 is in the electric current progressive die
Mutually change between formula (CCM) and discontinuous mode (DCM), both variations all easily cause electromagnetic interference problem.And this implementation
The power supply switch circuit 100 of example carries out nothing by controlling LDO and DC-DC conversion circuit 10 between underloading and unloaded condition
Seaming and cutting are changed, and noise of the LDO under light-load mode is very low, therefore the problem of largely avoid electromagnetic interference.
The power supply switch circuit of the present embodiment is by the way that DC-DC conversion circuit and low pressure difference linear voltage regulator to be connected in parallel
Load end, and seamless switching is carried out according to the different conditions of load, the overall efficiency of system power supply can be improved.In addition, electronic cutting
The setting on powered-down road can effectively realize the isolation of DC-DC conversion circuit and low pressure difference linear voltage regulator, and the two is avoided to cut
Influencing each other during changing, to ensure that the reliability etc. of the power supply switch circuit.
Referring to figure 2., another embodiment of the present invention proposes a kind of electronic equipment, which can be used above-mentioned implementation
The power supply switch circuit 100 of example 1 is used as power supply structure.It is appreciated that the option in above-described embodiment 1 is equally applicable to this reality
The electronic equipment of example is applied, therefore this will not be detailed here.
Wherein, which can be powered using AC power source, and the power supply switch circuit 100 should include AC-DC at this time
Adapter 50, certainly, the electronic equipment of the present embodiment are also possible to the equipment being powered using this kind of DC power supply of battery, with
And the equipment more demanding to power supply overall efficiency.Exemplarily, it may include, but are not limited to as intelligent door lock, intelligent doorbell, number
Word clock, laptop etc..The overall efficiency of the electronic apparatus system power supply is improved by the power supply switch circuit.
In all examples being illustrated and described herein, any occurrence should be construed as merely illustratively, without
It is as limitation, therefore, other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitation of the scope of the invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection model of the invention
It encloses.
Claims (10)
1. a kind of power supply switch circuit characterized by comprising DC-DC conversion circuit, electronic switching circuit and low pressure difference linearity
Voltage-stablizer, the input terminal of the DC-DC conversion circuit connect the input terminal of the low pressure difference linear voltage regulator, and the DC-DC turns
The input terminal of circuit is changed for connecting DC power supply；
The output end of the DC-DC conversion circuit connects the input terminal of the electronic switching circuit, the DC-DC conversion circuit
Enable end and the enable end of the electronic switching circuit are used to connection control terminal；
The output end of the electronic switching circuit connects the output end of the low pressure difference linear voltage regulator, the electronic switching circuit
Output end for connect load, wherein the output voltage of the DC-DC conversion circuit be greater than the low pressure difference linear voltage regulator
Maximum output voltage；
The control terminal, which is used to work as, to be loaded to start, the DC-DC conversion circuit under non-light condition and making the electronic cutting
Powered-down road is connected, so that the DC-DC conversion circuit is the load supplying；
The control terminal is also used to work as and load to start the DC-DC conversion circuit not and making the electronics
Switching circuit disconnects, so that the low pressure difference linear voltage regulator is the load supplying.
2. power supply switch circuit according to claim 1, which is characterized in that further include: the power supply as the control terminal
Managing chip, the enable end of the DC-DC conversion circuit and the enable end of the electronic switching circuit are all connected with the power supply pipe
Manage chip.
3. power supply switch circuit according to claim 1, which is characterized in that the control terminal is the master control core of the load
Piece, the enable end of the DC-DC conversion circuit are used to connect the main control chip with the enable end of the electronic switching circuit.
4. power supply switch circuit according to claim 1, which is characterized in that the electronic switching circuit includes electronic cutting
It closes, the electronic switch is triode, metal-oxide-semiconductor or relay.
5. power supply switch circuit according to claim 4, which is characterized in that described when the electronic switch is metal-oxide-semiconductor
The grid of metal-oxide-semiconductor connects the output end of the DC-DC conversion circuit for connecting the control terminal, source electrode, drains for connecting
The load.
6. power supply switch circuit according to claim 1, which is characterized in that further include: AC-DC adapter, the AC-DC
For the input terminal of adapter for connecting AC power source, output end connects the input terminal of the DC-DC conversion circuit；
The AC-DC adapter be used to be converted to the AC power source input after DC power supply the DC-DC conversion circuit and
The low pressure difference linear voltage regulator.
7. power supply switch circuit according to claim 1, which is characterized in that further include: for connecting the battery-end of battery
Son, the battery terminal connect the input terminal of the DC-DC conversion circuit.
8. power supply switch circuit according to claim 7, which is characterized in that further include: the electricity as the DC power supply
Pond, the battery are connect with the battery terminal；The battery is dry cell or battery.
9. a kind of electronic equipment, which is characterized in that including power supply switch circuit according to claim 1-8.
10. electronic equipment according to claim 9, which is characterized in that the electronic equipment is intelligent door lock or intelligent door
Bell.
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| CN201910743748.3A CN110323736A (en) | 2019-08-13 | 2019-08-13 | Power supply switch circuit and electronic equipment |
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| CN201910743748.3A CN110323736A (en) | 2019-08-13 | 2019-08-13 | Power supply switch circuit and electronic equipment |
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| CN110635469A (en) * | 2019-10-12 | 2019-12-31 | 深圳市爱兰博功率电子有限公司 | Parallel power expansion circuit and method |
| CN111158419A (en) * | 2020-01-13 | 2020-05-15 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN111313689A (en) * | 2019-12-02 | 2020-06-19 | 重庆大学 | A DC/DC Converter System Architecture with High Light Load Efficiency |
| CN111555616A (en) * | 2020-05-22 | 2020-08-18 | 华大半导体有限公司 | Power management system and method |
| CN111769751A (en) * | 2020-05-15 | 2020-10-13 | 海信（山东）空调有限公司 | Direct current power supply circuit and air conditioner |
| CN112558677A (en) * | 2020-12-09 | 2021-03-26 | 思瑞浦微电子科技（苏州）股份有限公司 | Low dropout regulator based on reverse current protection |
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| CN113852270A (en) * | 2020-06-28 | 2021-12-28 | 深圳市万普拉斯科技有限公司 | Display power supply voltage regulator circuit, control method and display power supply circuit |
| CN113949261A (en) * | 2020-07-17 | 2022-01-18 | 成都秦川物联网科技股份有限公司 | Internet of things intelligent gas meter powered by double power supplies |
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| CN114944742A (en) * | 2022-05-31 | 2022-08-26 | 维沃移动通信有限公司 | Voltage conversion circuit and electronic device |
| CN116700415A (en) * | 2023-06-14 | 2023-09-05 | 圣邦微电子（北京）股份有限公司 | Power supply circuit of power management chip, power supply method and power management chip |
| CN117008675A (en) * | 2023-04-06 | 2023-11-07 | 北京兆讯恒达技术有限公司 | A dynamic adjustment circuit and electronic equipment for chip core voltage |
| CN117251015A (en) * | 2023-10-12 | 2023-12-19 | 深圳市今朝时代股份有限公司 | A dynamic chip power supply circuit and method |
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| CN110635469A (en) * | 2019-10-12 | 2019-12-31 | 深圳市爱兰博功率电子有限公司 | Parallel power expansion circuit and method |
| CN110635469B (en) * | 2019-10-12 | 2021-11-09 | 深圳市爱兰博功率电子有限公司 | Parallel power expansion circuit and method |
| CN111313689A (en) * | 2019-12-02 | 2020-06-19 | 重庆大学 | A DC/DC Converter System Architecture with High Light Load Efficiency |
| CN111158419A (en) * | 2020-01-13 | 2020-05-15 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN111158419B (en) * | 2020-01-13 | 2022-02-01 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN111769751A (en) * | 2020-05-15 | 2020-10-13 | 海信（山东）空调有限公司 | Direct current power supply circuit and air conditioner |
| CN111555616A (en) * | 2020-05-22 | 2020-08-18 | 华大半导体有限公司 | Power management system and method |
| CN113852270A (en) * | 2020-06-28 | 2021-12-28 | 深圳市万普拉斯科技有限公司 | Display power supply voltage regulator circuit, control method and display power supply circuit |
| CN113949261A (en) * | 2020-07-17 | 2022-01-18 | 成都秦川物联网科技股份有限公司 | Internet of things intelligent gas meter powered by double power supplies |
| CN112558677A (en) * | 2020-12-09 | 2021-03-26 | 思瑞浦微电子科技（苏州）股份有限公司 | Low dropout regulator based on reverse current protection |
| CN112583255A (en) * | 2020-12-18 | 2021-03-30 | 合肥联宝信息技术有限公司 | Power supply device of electronic equipment and electronic equipment |
| CN112737300A (en) * | 2020-12-29 | 2021-04-30 | 联合汽车电子有限公司 | Duty ratio compensation method and system and readable storage medium |
| CN113972865A (en) * | 2021-10-29 | 2022-01-25 | 歌尔科技有限公司 | Motor vibration control system and method and intelligent wearable device |
| CN113972865B (en) * | 2021-10-29 | 2024-09-27 | 歌尔科技有限公司 | Motor vibration control system, method and intelligent wearable device |
| CN114944742A (en) * | 2022-05-31 | 2022-08-26 | 维沃移动通信有限公司 | Voltage conversion circuit and electronic device |
| CN117008675A (en) * | 2023-04-06 | 2023-11-07 | 北京兆讯恒达技术有限公司 | A dynamic adjustment circuit and electronic equipment for chip core voltage |
| CN116700415A (en) * | 2023-06-14 | 2023-09-05 | 圣邦微电子（北京）股份有限公司 | Power supply circuit of power management chip, power supply method and power management chip |
| CN117251015A (en) * | 2023-10-12 | 2023-12-19 | 深圳市今朝时代股份有限公司 | A dynamic chip power supply circuit and method |
| CN117251015B (en) * | 2023-10-12 | 2026-01-23 | 深圳市今朝时代股份有限公司 | Dynamic chip power supply circuit and method |
| CN118677252A (en) * | 2024-08-22 | 2024-09-20 | 荣耀终端有限公司 | Power supply circuit, chip and electronic equipment |
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