CN110299840A - Power circuit - Google Patents
Power circuit Download PDFInfo
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- CN110299840A CN110299840A CN201910603191.3A CN201910603191A CN110299840A CN 110299840 A CN110299840 A CN 110299840A CN 201910603191 A CN201910603191 A CN 201910603191A CN 110299840 A CN110299840 A CN 110299840A
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- electric current
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Classifications
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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
- H02M3/1563—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 without using an external clock
Abstract
The embodiment of the present invention provides a kind of power circuit, it include: controller, Buck circuit unit, detection unit, voltage regulation unit and electric current comparing unit, wherein, the detection unit is connect with the Buck circuit unit, the voltage regulation unit and the controller respectively, the electric current comparing unit is connect with the Buck circuit unit, the controller and the voltage regulation unit respectively, and the voltage regulation unit is also connect with the Buck circuit unit and the controller respectively.For improving the working efficiency of Buck circuit unit with the increase of output electric current.
Description
Technical field
The present embodiments relate to field of electronic circuitry more particularly to a kind of power circuits.
Background technique
Be usually provided in electronic equipment (for example, server, solar controller) BUCK power supply, input power and
At least one load.Wherein, the input terminal of BUCK power supply is connect with input power, and the output end of BUCK power supply is negative at least one
Connection is carried, the voltage value (for example, 12 volts) of input power can be converted at least one load required voltage by BUCK power supply
It is worth (for example, 1.2 volts).
In practical applications, BUCK power supply includes BUCK chip, is provided with metal-oxide half field effect transistor in BUCK chip
The driving voltage of (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), MOSFET are logical
Often it is fixed value (for example, 4.5 volts).In at least one load of BUCK power supply connection, so that BUCK power supply is negative at least one
When the electric current of load output reaches a certain current value (for example, 15 amperes), BUCK power supply can achieve maximum efficiency.If continuing
Increase the load of BUCK power supply connection, then the value of the electric current of BUCK power supply output continues to increase.In above process, due to
When the driving voltage of MOSFET is fixed value, therefore, cause the value of the electric current exported in BUCK power supply from above-mentioned a certain current value
When being changed to maximum value current value, the working efficiency of BUCK power supply is reduced with the increase of output electric current.
Summary of the invention
The embodiment of the present invention provides a kind of power circuit, for making the working efficiency of Buck circuit unit with Buck circuit
The increase of the output electric current of unit and improve.
In a first aspect, the embodiment of the present invention provides a kind of power circuit, comprising: controller, Buck circuit unit, detection are single
Member, voltage regulation unit and electric current comparing unit, wherein
The detection unit is connect with the Buck circuit unit, the voltage regulation unit and the controller respectively,
The electric current comparing unit is connect with the Buck circuit unit, the controller and the voltage regulation unit respectively, described
Voltage regulation unit is also connect with the Buck circuit unit and the controller respectively；
The detection unit is used for, and detects the input/output state of the Buck circuit unit, and send out to the controller
The input/output state of the Buck circuit unit is sent, the input/output state includes input voltage, input current, output electricity
Pressure, output electric current；
The controller is used for, and is imitated according to the input/output state of the Buck circuit unit and preset promotion
Rate determines first voltage and the first electric current；
The electric current comparing unit is used for, according to the output electric current of first electric current and the Buck circuit unit, to
The voltage regulation unit sends control signal, so that the voltage regulation unit works according to the control signal enabling；
The controller is also used to, and after determining the voltage regulation unit starting work, is adjusted the voltage and is adjusted list
The output voltage of member, so that the output voltage of the voltage regulation unit is the first voltage, so that the Buck circuit list
The working efficiency of member is the raising efficiency.
In a kind of possible embodiment, the Buck circuit unit includes: the first power supply, Buck chip and the first electricity
Sense, wherein
The first end and second end of the Buck chip is connect with first power supply respectively, the third of the Buck chip
End is connect with the voltage regulation unit, the 4th end and the 5th end of the Buck chip one end with first inductance respectively
Connection, the other end of first inductance are the output end of the power circuit；
The voltage regulation unit is used for, and Xiang Suoshu Buck chip inputs the first voltage；
The input voltage of the Buck circuit unit is the voltage of first power supply, the input of the Buck circuit unit
Electric current is the electric current of first power supply, and the output voltage of the Buck circuit unit is the electricity of the output end of the power circuit
Pressure, the output electric current of the Buck circuit unit are the electric current of the output end of the power circuit.
In alternatively possible embodiment, the voltage regulation unit includes: first switch, second switch, first
Amplifier, first resistor, second resistance and 3rd resistor, wherein
The first end of the first switch is connect with first power supply, the second end of the first switch and described first
The output end of amplifier connects, the inverting input terminal at the third end of the first switch and first amplifier, and described first
The third end of switch is the output end of the voltage regulation unit；
First power supply, the first resistor and the second resistance are sequentially connected in series, the second resistance with connect
The 3rd resistor and the second switch afterwards is in parallel, and the non-inverting input terminal of first amplifier is connected to first electricity
At the tie point of resistance and the second resistance, the driving end of first amplifier is connect with first power supply；
The controller is connect with the 3rd resistor, and the controller is used to adjust the resistance value of the 3rd resistor,
So that the output voltage of the voltage regulation unit is the first voltage.
In alternatively possible embodiment, the electric current comparing unit includes: that current detection module and electric current compare
Module, wherein
The current detection module is connect with the Buck circuit unit and the current comparing module respectively, the electric current
Comparison module is also connect with the controller, the voltage regulation unit respectively；
The current detection module is used for, and is detected to the output electric current of the power circuit, and detection electric current is obtained, and
Processing is amplified to the detection electric current, to obtain amplification electric current；
The current comparing module is used for, and is compared to first electric current and the amplification electric current, described in determination
When amplifying electric current greater than first electric current, Xiang Suoshu voltage regulation unit sends control signal.
In alternatively possible embodiment, the current detection module includes: detection sub-module and enhanced processing
Module, wherein
The detection sub-module is connect with the Buck circuit unit and the enhanced processing submodule respectively；
The detection sub-module is used for, and is detected to the output electric current of the power circuit, to obtain the detection electricity
Stream；
The enhanced processing submodule is used for, and processing is amplified to the detection electric current, to obtain the amplification electric current.
In alternatively possible embodiment, the detection sub-module includes: the 4th resistance, the 5th resistance, the 6th electricity
Resistance and first capacitor, wherein
One end of 4th resistance is connect with one end of first inductance, the other end of the 4th resistance with it is described
One end of 5th resistance connects；
One end of 6th resistance is connect with the other end of the 5th resistance, the other end of the 6th resistance and institute
State the other end connection of the first inductance, the first capacitor and the 6th resistor coupled in parallel.
In alternatively possible embodiment, the enhanced processing submodule include: the second amplifier, the 7th resistance,
8th resistance and the 9th resistance, wherein
The non-inverting input terminal of second amplifier is connect by the 7th resistance with one end of the first capacitor, institute
The inverting input terminal for stating the second amplifier is connect by the 8th resistance with the other end of the first capacitor, and described second puts
The output end of big device connect with current comparing module, is connected by the inverting input terminal of the 9th resistance and second amplifier
It connects, the driving end of second amplifier is connect with first power supply.
In alternatively possible embodiment, the current comparing module includes: the tenth resistance, eleventh resistor and
Three amplifiers, wherein,
First power supply, the tenth resistance and the eleventh resistor are sequentially connected in series, the third amplifier it is anti-
The Node connectedness of phase input terminal and the tenth resistance and the eleventh resistor, the non-inverting input terminal of the third amplifier with
The output end of second amplifier connects, and the output end of the third amplifier is connect with the second switch, the third
The driving end of amplifier is connect with first power supply；
Tenth resistance and the eleventh resistor are also connect with the controller respectively；
Second amplifier is used for, and the non-inverting input terminal of Xiang Suoshu third amplifier inputs the amplified signal；
The controller is used for, and the resistance value of the tenth resistance and the eleventh resistor is adjusted, so that the third
The electric current of the inverting input terminal of amplifier is first electric current.
In alternatively possible embodiment, the first switch and the second switch are metal-oxide half field effect transistor
MOSFET。
In alternatively possible embodiment, the detection unit includes at least two voltage sensors and at least two
Current sensor, wherein
At least two voltage sensor and at least two current sensor are connect with the controller respectively, institute
At least two current sensors and at least two voltage sensor is stated also to connect with the Buck circuit unit respectively.
The power circuit that present example provides, comprising: controller, Buck circuit unit, detection unit, voltage adjust single
Member and electric current comparing unit, wherein detection unit is connect with Buck circuit unit, voltage regulation unit and controller respectively, electricity
Stream comparing unit connect respectively with Buck circuit unit, controller and voltage regulation unit, voltage regulation unit also respectively with
Buck circuit unit is connected with controller；Detection unit is used for, and detects the input/output state and voltage of Buck circuit unit
The output voltage of unit is adjusted, and sends the input/output state and voltage regulation unit of Buck circuit unit to controller
Output voltage, input/output state include input voltage, input current, output voltage, output electric current；Controller is used for, root
According to the input/output state of Buck circuit unit, the output voltage of preset raising efficiency and voltage regulation unit, determine
First voltage and the first electric current；Electric current comparing unit is used for, according to the output electric current of the first electric current and Buck circuit unit, to electricity
Pressure adjusts unit and sends control signal, so that voltage regulation unit works according to control signal enabling；Controller is also used to, true
After constant voltage adjusts unit starting work, the output voltage of voltage regulation unit is adjusted, so that the output electricity of voltage regulation unit
Pressure is first voltage, and the working efficiency of Buck circuit unit is raising efficiency.In above process, controller adjusts voltage and adjusts
The output voltage of unit, so that the output voltage of voltage regulation unit is first voltage, the work of Buck circuit unit is imitated
Rate is raising efficiency, so that the working efficiency of Buck circuit unit is improved as it exports the increase of electric current.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the application scenarios schematic diagram of power circuit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram one of power circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of Buck circuit unit provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of voltage regulation unit provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of electric current comparing unit provided in an embodiment of the present invention；
Fig. 6 is the detailed construction schematic diagram of electric current comparing unit provided in an embodiment of the present invention and detection unit.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is the application scenarios schematic diagram of power circuit provided in an embodiment of the present invention.As shown in Figure 1, comprising: power supply electricity
Road 10 and load 11.Wherein, power circuit 10 includes the first power supply, Buck chip and voltage regulation unit, Buck chip difference
It is connect with the first power supply, voltage regulation unit and load 11.
In actual application, the voltage value that the first power supply exports can be converted into what load 11 needed by Buck chip
Voltage value, meanwhile, to 11 input currents are loaded, with 11 work of driving load.During 11 work of load, voltage tune
The driving voltage for saving MOSFET in the adjustable Buck chip of unit, when the working efficiency of power circuit 10 does not reduce, Buck
The driving voltage of MOSFET is generally fixed for 4.5 volts in chip.When the working efficiency of power circuit 10 reduces, adjustable electricity
Pressure adjusts the output voltage of unit, so that voltage regulation unit, which provides driving voltage to MOSFET, is greater than 4.5 volts, so that electric
The working efficiency of source circuit is promoted with the increase to output electric current.
In the following, technical solution shown in the application is described in detail by specific embodiment.Under it should be noted that
The several specific embodiments in face can be combined with each other, and for the same or similar content, no longer carry out weight in various embodiments
Multiple explanation.
Fig. 2 is the structural schematic diagram one of power circuit provided in an embodiment of the present invention.As shown in Fig. 2, the power circuit
It include: controller 11, Buck circuit unit 12, detection unit 13, voltage regulation unit 14 and electric current comparing unit 15, wherein
Detection unit 13 is connect with Buck circuit unit 12, voltage regulation unit 14 and controller 11 respectively, and electric current compares
Unit 15 is connect with Buck circuit unit 12, controller 11 and voltage regulation unit 14 respectively, voltage regulation unit also respectively with
Buck circuit unit 12 and controller 11 connect；
Detection unit 13 is used for, and detects the input/output state of Buck circuit unit 12, and send Buck to controller 11
The input/output state of circuit unit 12, input/output state include input voltage, input current, output voltage, output electric current；
Controller 11 is used for, and according to the input/output state of Buck circuit unit and preset raising efficiency, is determined
First voltage and the first electric current；
Electric current comparing unit 15 is used for, and according to the output electric current of the first electric current and Buck circuit unit, is adjusted to voltage single
Member sends control signal, so that voltage regulation unit works according to control signal enabling；
Controller 11 is also used to, and after determining that voltage regulation unit 14 starts work, adjusts the defeated of voltage regulation unit 14
Voltage out, so that the value of the output voltage of voltage regulation unit is the value of first voltage, the working efficiency of Buck circuit unit is
Raising efficiency.
It should be noted that controller can be obtained according to the input/output state of Buck circuit unit by theoretical calculation
The first electric current and first voltage when the working efficiency of Buck circuit unit is raising efficiency out.Optionally, examination can also be passed through
Test measures out the first electric current and first voltage.
Specifically, including two current sensors and two voltage sensors in detection unit 13, wherein two electric currents pass
Sensor and two voltage sensors can detecte the input/output state of Buck circuit unit 12.Further, controller 11 can
The input/output state of Buck circuit unit 12 is obtained from two current sensors and two voltage sensors.
It should be noted that electric current comparing unit 15 is used to compare the output electric current of the first electric current and Buck circuit unit
Size sends control signal to voltage regulation unit when the output electric current for determining Buck circuit unit is greater than the first electric current.
Specifically, control signal is high level, the voltage value of the high level can be 5 volts, 6 volts etc., and the application is herein
The voltage value of high level is not limited.
Optionally, detection unit 13 can also include another voltage sensor, which can detecte control
Signal can send detection information to controller, controller can root in the presence of the voltage sensor detects control signal
Determine whether voltage regulation unit 14 starts work according to detection information.
In practical applications, after voltage regulation unit 14 starts work, controller can be by voltage regulation unit 14
Output voltage values are adjusted to first voltage (voltage value of the first voltage is typically larger than 4.5V), and using first voltage as electricity
Pressure adjusts the driving voltage of the MOSFET in unit 14 in Buck chip.In above process, using the driving electricity greater than 4.5V
Pressure can reduce MOSFET power loss, and then promote the working efficiency of power circuit.
In the following, to the driving voltage for improving the MOSFET in Buck chip, the reason of MOSFET power loss can be reduced
It is described in detail.
Specifically, the power loss of MOSFET can be determined by following formula 1:
P=Ploss+P′lossFormula 1
Wherein, the power loss (unit: watt, write a Chinese character in simplified form: W) that P is MOSFET, PlossThe power of MOSFET when for high end trim
Loss, P 'lossThe power loss of MOSFET when for low end trim.
In above-mentioned formula 1, P can be determined by following formula 2loss:
Ploss=Pcon+Pswi+PdriFormula 2,
Wherein, PconThe conduction loss of MOSFET, P when for high end trimswiThe switching loss of MOSFET when for high end trim,
PdriThe drive loss of MOSFET；
In above-mentioned formula 1, P ' can be determined by following formula 3loss:
P′loss=P 'con+PdriFormula 3,
Wherein, P 'lossThe power loss of MOSFET, P ' when for low end trimconThe conducting damage of MOSFET when for low end trim
Consumption.
In above-mentioned formula 2, P can be determined by following formula 4con:
Pcon=Iout 2·Rds(on)D formula 4,
Wherein, IoutWhen for MOSFET being high end trim Buck chip output electric current (unit: ampere is write a Chinese character in simplified form: A),
Rds(on)For the conducting resistance of MOSFET, (unit: ohm is write a Chinese character in simplified form: ohm), D is duty ratio.
In above-mentioned formula 2, P can be determined by following formula 5swi:
Pswi=Vin·Iout·TswF/2 formula 5,
Wherein, TswFor the sum of the rise time of MOSFET and fall time, f is the switching frequency (unit: conspicuous of MOSFET
Hereby, it writes a Chinese character in simplified form: Hz).
In above-mentioned formula 2, P can be determined by following formula 6dri:
Pdri=Qg·VgsF formula 6,
Wherein, QgFor gate-drive charge (unit: coulomb is write a Chinese character in simplified form: C), VgsFor MOSFET driving voltage (unit: volt,
It writes a Chinese character in simplified form: V).
In above-mentioned formula 3, P ' can be determined by following formula 7con:
P′con=Iout 2·Rds(on)(1-D) formula 7.
In above-mentioned formula 4, D can be determined by following formula 8:
D=Vout/VinFormula 8,
Wherein, VoutFor the output voltage of Buck chip, VinFor the input voltage of Buck chip.
In above-mentioned formula 5, T can be determined by following formula 9sw:
Tsw=Trise+TfallFormula 9,
Wherein, TriseFor MOSFET rise time (unit: the second, referred to as: s), TfallIt is (single for the lower liter of time of MOSFET
Position: the second, referred to as: s).
In it should actually use, when MOSFET is CSD17587, MOSFET has following parameter: f=5 × 105Hz、D
=0.1, MOSFET CSD17587, VgsThe corresponding Rds of=4.5V(on)=7.9mohm, VgsThe corresponding Rds of=10V(on)=
5.9mohm、VgsThe corresponding Q of=4.5Vg=7.9nC, VgsThe corresponding Q of=10Vg=17.2nC receives coulomb, Trise=22ns, Tfall
=2ns.
In the following, with Vin=12V, VoutFor=1.2V, when electric current is fixed value, the power loss P of MOSFET is with drive
Dynamic voltage VgsIncrease and the case where reduce, be illustrated.
For example, IoutWhen=5A, if Vgs=4.5V is then obtained according to above-mentioned formula 1 to formula 9 and above-mentioned property parameters
Power loss P=0.593W；If Vgs=10V then obtains power damage according to above-mentioned formula 1 to formula 9 and above-mentioned property parameters
Consume P=0.543W.Therefore, power loss P reduces (0.593-0.543)/(1.2 × 5)=0.8%.
For example, IoutWhen=10A, if Vgs=4.5V is then obtained according to above-mentioned formula 1 to formula 9 and above-mentioned property parameters
To power loss P=1.545W；If Vgs=10V then obtains power according to above-mentioned formula 1 to formula 9 and above-mentioned property parameters
P=1.345W is lost.Therefore, power loss P reduces (1.545-1.345)/(1.2 × 5)=1.6%.
For example, IoutWhen=15A, if Vgs=4.5V is then obtained according to above-mentioned formula 1 to formula 9 and above-mentioned property parameters
To power loss P=2.893W；If Vgs=10V then obtains power according to above-mentioned formula 1 to formula 9 and above-mentioned property parameters
P=2.443W is lost.Therefore, power loss P reduces (2.893-2.443)/(1.2 × 5)=2.5%.
In conclusion in IoutDuring increase, power loss P is gradually increased, i.e., the working efficiency of MOSFET with
IoutIncrease and improves.
The power circuit that present example provides, comprising: controller, Buck circuit unit, detection unit, voltage adjust single
Member and electric current comparing unit, wherein detection unit is connect with Buck circuit unit, voltage regulation unit and controller respectively, electricity
Stream comparing unit connect respectively with Buck circuit unit, controller and voltage regulation unit, voltage regulation unit also respectively with
Buck circuit unit is connected with controller；Detection unit is used for, and detects the input/output state and voltage of Buck circuit unit
The output voltage of unit is adjusted, and sends the input/output state and voltage regulation unit of Buck circuit unit to controller
Output voltage, input/output state include input voltage, input current, output voltage, output electric current；Controller is used for, root
According to the input/output state of Buck circuit unit, the output voltage of preset raising efficiency and voltage regulation unit, determine
First voltage and the first electric current；Electric current comparing unit is used for, according to the output electric current of the first electric current and Buck circuit unit, to electricity
Pressure adjusts unit and sends control signal, so that voltage regulation unit works according to control signal enabling；Controller is also used to, true
After constant voltage adjusts unit starting work, the output voltage of voltage regulation unit is adjusted, so that the output electricity of voltage regulation unit
Pressure is first voltage, and the working efficiency of Buck circuit unit is raising efficiency.In above process, controller adjusts voltage and adjusts
The output voltage of unit, so that the output voltage of voltage regulation unit is first voltage, the work of Buck circuit unit is imitated
Rate is raising efficiency, so that the working efficiency of Buck circuit unit is improved as it exports the increase of electric current.
On the basis of any one above-mentioned embodiment, below with reference to Fig. 3 to power circuit provided in an embodiment of the present invention
In Buck circuit unit be described in detail, specifically, referring to Fig. 3.
Fig. 3 is the structural schematic diagram of Buck circuit unit provided in an embodiment of the present invention.On the basis of Fig. 2, such as Fig. 3 institute
Show, Buck circuit unit 12 includes: the first power supply 120, Buck chip 121 and the first inductance 122, wherein
The first end and second end of Buck chip 121 is connect with the first power supply 120 respectively, the third end of Buck chip 121
It being connect with voltage regulation unit 14, the 4th end of Buck chip 121 and the 5th end are connect with one end of the first inductance 122 respectively,
The other end of first inductance 122 is the output end of power circuit；
Voltage regulation unit 14 is used for, and inputs first voltage to Buck chip 121；
The input voltage of Buck circuit unit 12 is the voltage of the first power supply, and the input current of Buck circuit unit is first
The electric current of power supply, the output voltage of Buck circuit unit are the voltage of the output end of power circuit, the output of Buck circuit unit
Electric current is the electric current of the output end of power circuit.
It should be noted that the pin that the pin of the first end of Buck chip 121 is identified as 9, second end is identified as 14,
The pin that the pin that the pin at three ends is identified as the 8, the 4th end is identified as the 15, the 5th end is identified as 16.
Further, the second end (pin with the output end of the first power supply 120, Buck chip 121 respectively of detection unit 13
Be identified as 8), the output end of power circuit connection.
Specifically, Buck circuit unit 12 further include: capacitor 123, capacitor 124, capacitor 125, capacitor 126, resistance 127,
Resistance 128 and resistance 129.
It should be noted that capacitor 123, capacitor 124, capacitor 125, capacitor 126, resistance 127, resistance 128, resistance 129,
Buck chip 121, the first inductance 122 connection relationship can be found in Fig. 4, do not repeating herein.
Optionally, capacitor 123, capacitor 124, capacitor 125 and capacitor 126 can be electric capacity of the dacron, ceramic disc capacitor, mica electricity
Appearance, monolithic capacitor, electrolytic capacitor, tantalum capacitor etc..
Optionally, resistance 127, resistance 128 and resistance 129 can be that the resistance of fixed resistance value or resistance value can
Power transformation resistance.
In practical applications, the output voltage of the first power supply can be 12 volts or 5 volts.
On the basis of any one above-mentioned embodiment, below with reference to Fig. 4 to the voltage regulation unit in power circuit into
Row detailed description, specifically, referring to Fig. 4.
Fig. 4 is the structural schematic diagram of voltage regulation unit provided in an embodiment of the present invention.On the basis of Fig. 3, such as Fig. 4 institute
Show, voltage regulation unit 14 includes: first switch 140, second switch 141, the first amplifier 142, first resistor 143, second
Resistance 144 and 3rd resistor 145, wherein
The first end of first switch 140 is connect with the first power supply 120, the second end of first switch 140 and the first amplifier
142 output end connection, the inverting input terminal at the third end of first switch 140 and the first amplifier 142, first switch 140
Third end is the output end of voltage regulation unit 14；
First power supply 120, first resistor 143 and second resistance 144 are sequentially connected in series, second resistance 144 with connect after
3rd resistor 145 and second switch 142 are in parallel, and the non-inverting input terminal of the first amplifier 142 is connected to first resistor 143 and second
At the tie point of resistance 144；
Controller 11 is connect with 3rd resistor 145, and controller 11 is used to adjust the resistance value of 3rd resistor 145, so that electric
The output voltage that pressure adjusts unit 14 is first voltage.
In a kind of possible embodiment, the first switch 140 and the second switch 141 are that OH is brilliant
Body pipe MOSFET.
Specifically, when first switch 140 and second switch 141 are MOSFET, the drain electrode of first switch 140 and the first power supply
120 connections, the grid of second switch 141 are connect with electric current comparing unit 15, the driving end 2 of the first amplifier, first resistor 143
One end 3 connect respectively with the first power supply 120.
In the present invention, 3rd resistor 145 is the resistance that controller can control, and controls 3rd resistor in controller 11
When 145 resistance value increases, the output voltage of voltage regulation unit 14 increases, and controls the electricity of 3rd resistor 145 in controller 11
When resistance value reduces, the output voltage of voltage regulation unit 14 reduces.
Optionally, voltage regulation unit 14 further include: diode 146, resistance 147, resistance 148 and capacitor 149.Its
In, first resistor 143, second resistance 144,3rd resistor 145, resistance 147 and resistance 148 can be the electricity of fixed resistance value
Resistance.
Specifically, the connection of diode 146, resistance 147, resistance 148 and capacitor 149 in voltage regulation unit 14
Relationship is as shown in figure 4, details are not described herein again.
It should be noted that the driving voltage of BUCK chip interior MOSFET is reached by the diode of BUCK chip interior
The grid of MOSFET, the driving voltage of BUCK chip interior MOSFET can also reach the grid of MOSFET by diode 146.
Since the driving voltage of UCK chip interior MOSFET depends on high driving voltage, it is not influenced under two driving voltages
The work of BUCK chip itself.
On the basis of any one above-mentioned embodiment, below with reference to Fig. 5 to the electric current comparing unit in power circuit into
Row detailed description, specifically, referring to Fig. 5.
Fig. 5 is the structural schematic diagram of electric current comparing unit provided in an embodiment of the present invention.On the basis of Fig. 2, such as Fig. 5 institute
Show, electric current comparing unit includes current detection module 50 and current comparing module 51, wherein
Current detection module 50 is connect with Buck circuit unit 12 and current comparing module 51 respectively, current comparing module 51
Also it is connect respectively with controller 11 and voltage regulation unit 14；
Current detection module 50 is used for, and is detected to the output electric current of power circuit, obtains detection electric current, and to detection
Electric current amplifies processing, to obtain amplification electric current；
Current comparing module 51 is used for, and is compared to the first electric current and amplification electric current, is determining that amplification electric current is greater than the
When one electric current, control signal is sent to voltage regulation unit 14.
In a kind of possible embodiment, current detection module 50 includes: detection sub-module 501 and enhanced processing submodule
Block 502, wherein
Detection sub-module 501 is connect with Buck circuit unit and enhanced processing submodule 502 respectively；
Detection sub-module 501 is used for, and is detected to the output electric current of power circuit, to obtain detection electric current；
Enhanced processing submodule 502 is used for, and amplifies processing to detection electric current, to obtain amplification electric current.
In practical applications, due to the pressure drop very little of the first inductance 122, detection sub-module obtains detection electric current
Very little, so needing to amplify processing by 502 pairs of detection electric currents of enhanced processing submodule.
Electric current comparing unit provided by the present application has the following course of work: the both ends of detection sub-module and the first inductance,
The output electric current of power circuit is detected, detection electric current is obtained.Detection sub-module will obtain detection electric current and be input to amplification
Submodule is handled, enhanced processing submodule amplifies processing to detection electric current, obtains amplification electric current, and enhanced processing submodule will
Amplification electric current is sent to current comparing module.Current comparing module is compared the size of amplification electric current and the first electric current,
When determining that amplification electric current is greater than the first electric current, control signal is sent to second switch.Specifically, being in second switch 141
When MOSFET, control signal is sent to the gate pole of MOSFET.
On the basis of any one above-mentioned embodiment, in the following, in conjunction with Fig. 6 embodiment, it is single to electric current comparing unit and detection
Member is described in further detail, specifically, referring to Fig. 6.
Fig. 6 is the detailed construction schematic diagram of electric current comparing unit provided in an embodiment of the present invention and detection unit.Fig. 4's
On the basis of, refer to Fig. 6,15 detection sub-module 501 includes: the 4th resistance 5010, the 5th resistance in electric current comparing unit
5011, the 6th resistance 5012 and first capacitor 5013, wherein
One end of 4th resistance 5010 is connect with one end of the first inductance 122, the other end and the 5th of the 4th resistance 5010
One end of resistance 5011 connects；
One end of 6th circuit 5012 is connect with the other end of the 5th resistance 5011, the other end of the 6th resistance 5012 and
The other end of one inductance 122 connects, and first capacitor 5013 is in parallel with the 6th resistance 5012.
In a kind of possible way of example, the enhanced processing submodule 502 in electric current comparing unit includes: second to put
Big device 5020, the 7th resistance 5021, the 8th resistance 5022 and the 9th resistance 5023, wherein
The non-inverting input terminal of second amplifier 5020 is connect by the 7th resistance 5021 with one end of first capacitor 5013, the
The inverting input terminal of two amplifiers 5020 is connect by the 8th resistance 5022 with the other end of first capacitor 5013, the second amplifier
5020 output end connect with current comparing module, is connected by the inverting input terminal of the 9th resistance 5023 and the second amplifier 5020
It connects, the driving end of the second amplifier 5020 is connect with the first power supply 120.
In alternatively possible embodiment, the current comparing module 51 in electric current comparing unit includes: the tenth resistance
510, eleventh resistor 511 and third amplifier 512, wherein,
First power supply 120, the tenth resistance 510 and eleventh resistor 511 are sequentially connected in series, the inverting input terminal of third amplifier
With the Node connectedness of the tenth resistance 510 and eleventh resistor 511, the non-inverting input terminal of third amplifier and the second amplifier 5020
Output end connection, the output end of third amplifier 512 connect with second switch 141, the driving end of third amplifier 512 and the
The connection of one power supply；
Tenth resistance 510 and eleventh resistor 511 are also connect with controller respectively；
Second amplifier 5020 is used for, and inputs amplified signal to the non-inverting input terminal of third amplifier 512；
Controller 11 is used for, and the resistance value of the tenth resistance 510 and eleventh resistor 511 is adjusted, so that third amplifier 512
Inverting input terminal electric current be the first electric current.
Specifically, enhanced processing submodule further includes resistance 5024, electric current comparing unit further includes resistance 513.Wherein, electric
Resistance 5024 in the connection type of connection relationship and resistance 513 in electric current comparing unit in enhanced processing submodule, such as Fig. 6
Shown, details are not described herein again.
Further, driving end 5 and first power supply 120 at the driving end 4 and the second amplifier 5020 of third amplifier 512
Connection.The control port 1 of controller 11 is connect with 3rd resistor 145, control port 2 is connect with the tenth resistance 510, control port
3 connect with eleventh resistor 511.
It should be noted that the tenth resistance 510 and eleventh resistor 511 are controller adjustable resistor.Its resistance value can
Changed with the adjusting according to controller.
Optionally, the 4th resistance 5010, the 5th resistance 5011, the 6th resistance 5012, resistance 5024 and resistance 513 can
Think the fixed resistance of resistance value, naturally it is also possible to be the adjustable resistance of resistance value.First capacitor 5013 is the fixed capacitor of capacitance.
In a kind of possible embodiment, the detection unit 13 includes at least two voltage sensors and at least two
Current sensor, wherein
At least two voltage sensors and at least two current sensors are connect with controller respectively, and at least two electric currents pass
Two voltage sensors in sensor and at least two voltage sensors are also connect with Buck circuit unit respectively.
Specifically, including the first current sensor 131, the second current sensor 132, first voltage biography in detection unit 13
Sensor 133, second voltage sensor 134, wherein the first current sensor 131, the second current sensor 132, first voltage pass
Sensor 133, second voltage sensor 134, tertiary voltage sensor 135 are connect with controller respectively, the first current sensor 131
It is connect with first voltage sensor 133 with the first power supply 120, the second current sensor 132 and second voltage sensor 134 and electricity
The output end of source circuit connects.
Specifically, the first current sensor 131 can detecte the input current of Buck circuit unit, (i.e. the first power supply is defeated
Electric current out), first voltage sensor 133 can detecte input voltage (the i.e. output electricity of the first power supply of Buck circuit unit
Pressure), the second current sensor 132 can detecte the output electric current of Buck circuit unit, and second voltage sensor 134 can detecte
The output voltage of Buck circuit unit.
Power circuit provided in an embodiment of the present invention has the following course of work: the first current sensor 131, the second electric current
Sensor 132, first voltage sensor 133, second voltage sensor 134 obtain the input/output state of Buck circuit unit.
Controller 11 determines first voltage and first according to the input/output state of Buck circuit unit and the raising efficiency of default settings
Electric current.Detection sub-module detects the output electric current of power circuit, obtained detection electric current, and will test electric current and be sent to
Enhanced processing submodule.Enhanced processing submodule amplifies processing to detection electric current, obtains amplification electric current, and will amplify electric current
It is sent to current comparing module, at this point, the tenth resistance and eleventh resistor in controller control current comparing module, so that electric
The non-inverting input terminal for flowing the third amplifier in comparison module inputs amplified signal.Circuit current comparison module to the first electric current and
Amplification electric current is compared, and when determining that amplification electric current is greater than the first electric current, sends control signal to voltage regulation unit, so that
Voltage regulation unit is started to work, at this point, the 3rd resistor in controller control voltage regulation unit, so that voltage is adjusted
The output voltage of unit is first voltage.In above process, controller adjusts the output voltage of voltage regulation unit, to make
The output voltage for obtaining voltage regulation unit is first voltage, and the working efficiency of Buck circuit unit is raising efficiency, so that
The working efficiency of Buck circuit unit is improved with its increase for exporting electric current of device.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of power circuit characterized by comprising controller, Buck circuit unit, detection unit, voltage regulation unit
With electric current comparing unit, wherein
The detection unit is connect with the Buck circuit unit, the voltage regulation unit and the controller respectively, described
Electric current comparing unit is connect with the Buck circuit unit, the controller and the voltage regulation unit respectively, the voltage
Unit is adjusted also to connect with the Buck circuit unit and the controller respectively；
The detection unit is used for, and detects the input/output state of the Buck circuit unit, and send institute to the controller
State the input/output state of Buck circuit unit, the input/output state include input voltage, input current, output voltage,
Export electric current；
The controller is used for, according to the input/output state and preset raising efficiency of the Buck circuit unit, really
Determine first voltage and the first electric current；
The electric current comparing unit is used for, according to the output electric current of first electric current and the Buck circuit unit, Xiang Suoshu
Voltage regulation unit sends control signal, so that the voltage regulation unit works according to the control signal enabling；
The controller is also used to, and after determining the voltage regulation unit starting work, adjusts the voltage regulation unit
Output voltage, so that the output voltage of the voltage regulation unit is the first voltage, so that the Buck circuit unit
Working efficiency is the raising efficiency.
2. circuit according to claim 1, which is characterized in that the Buck circuit unit includes: the first power supply, Buck core
Piece and the first inductance, wherein
The first end and second end of the Buck chip is connect with first power supply respectively, the third end of the Buck chip with
The voltage regulation unit connection, the 4th end and the 5th end of the Buck chip connect with one end of first inductance respectively
It connects, the other end of first inductance is the output end of the power circuit；
The voltage regulation unit is used for, and Xiang Suoshu Buck chip inputs the first voltage；
The input voltage of the Buck circuit unit is the voltage of first power supply, the input current of the Buck circuit unit
For the electric current of first power supply, the output voltage of the Buck circuit unit is the voltage of the output end of the power circuit,
The output electric current of the Buck circuit unit is the electric current of the output end of the power circuit.
3. circuit according to claim 2, which is characterized in that the voltage regulation unit includes: first switch, second opens
Pass, the first amplifier, first resistor, second resistance and 3rd resistor, wherein
The first end of the first switch is connect with first power supply, the second end of the first switch and first amplification
The output end of device connects, the inverting input terminal at the third end of the first switch and first amplifier, the first switch
Third end be the voltage regulation unit output end；
First power supply, the first resistor and the second resistance are sequentially connected in series, the second resistance with connect after
The 3rd resistor and the second switch are in parallel, the non-inverting input terminal of first amplifier be connected to the first resistor and
At the tie point of the second resistance, the driving end of first amplifier is connect with first power supply；
The controller is connect with the 3rd resistor, and the controller is used to adjust the resistance value of the 3rd resistor, so that
The output voltage of the voltage regulation unit is the first voltage.
4. circuit according to claim 3, which is characterized in that the electric current comparing unit include: current detection module and
Current comparing module, wherein
The current detection module is connect with the Buck circuit unit and the current comparing module respectively, and the electric current compares
Module is also connect with the controller, the voltage regulation unit respectively；
The current detection module is used for, and is detected to the output electric current of the power circuit, obtains detection electric current, and to institute
It states detection electric current and amplifies processing, to obtain amplification electric current；
The current comparing module is used for, and is compared to first electric current and the amplification electric current, is being determined the amplification
When electric current is greater than first electric current, Xiang Suoshu voltage regulation unit sends control signal.
5. circuit according to claim 4, which is characterized in that the current detection module includes: detection sub-module and puts
Big processing submodule, wherein
The detection sub-module is connect with the Buck circuit unit and the enhanced processing submodule respectively；
The detection sub-module is used for, and is detected to the output electric current of the power circuit, to obtain the detection electric current；
The enhanced processing submodule is used for, and processing is amplified to the detection electric current, to obtain the amplification electric current.
6. circuit according to claim 5, which is characterized in that the detection sub-module includes: the 4th resistance, the 5th electricity
Resistance, the 6th resistance and first capacitor, wherein
One end of 4th resistance is connect with one end of first inductance, the other end and the described 5th of the 4th resistance
One end of resistance connects；
One end of 6th resistance is connect with the other end of the 5th resistance, the other end of the 6th resistance and described the
The other end of one inductance connects, the first capacitor and the 6th resistor coupled in parallel.
7. circuit according to claim 5, which is characterized in that the enhanced processing submodule includes: the second amplifier,
Seven resistance, the 8th resistance and the 9th resistance, wherein
The non-inverting input terminal of second amplifier is connect by the 7th resistance with one end of the first capacitor, and described
The inverting input terminal of two amplifiers is connect by the 8th resistance with the other end of the first capacitor, second amplifier
Output end connect with current comparing module, connect by the 9th resistance with the inverting input terminal of second amplifier,
The driving end of second amplifier is connect with first power supply.
8. circuit according to claim 7, which is characterized in that the current comparing module includes: the tenth resistance, the 11st
Resistance and third amplifier, wherein,
First power supply, the tenth resistance and the eleventh resistor are sequentially connected in series, and the reverse phase of the third amplifier is defeated
Enter end and the Node connectedness of the tenth resistance and the eleventh resistor, the non-inverting input terminal of the third amplifier with it is described
The output end of second amplifier connects, and the output end of the third amplifier is connect with the second switch, the third amplification
The driving end of device is connect with first power supply；
Tenth resistance and the eleventh resistor are also connect with the controller respectively；
Second amplifier is used for, and the non-inverting input terminal of Xiang Suoshu third amplifier inputs the amplified signal；
The controller is used for, and adjusts the resistance value of the tenth resistance and the eleventh resistor, so that the third is amplified
The electric current of the inverting input terminal of device is first electric current.
9. according to the described in any item circuits of claim 3 to 8, which is characterized in that the first switch and the second switch
For metal-oxide half field effect transistor MOSFET.
10. circuit according to claim 9, which is characterized in that the detection unit includes at least two voltage sensors
With at least two current sensors, wherein
At least two voltage sensor and at least two current sensor are connect with the controller respectively, it is described extremely
Few two current sensors and at least two voltage sensor are also connect with the Buck circuit unit respectively.
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| CN201910603191.3A CN110299840B (en) | 2019-07-05 | 2019-07-05 | Power supply circuit |
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