CN110299819A - A kind of digitlization power control circuit and method - Google Patents
A kind of digitlization power control circuit and method Download PDFInfo
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- CN110299819A CN110299819A CN201910499951.0A CN201910499951A CN110299819A CN 110299819 A CN110299819 A CN 110299819A CN 201910499951 A CN201910499951 A CN 201910499951A CN 110299819 A CN110299819 A CN 110299819A
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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
- H02M1/00—Details of apparatus for conversion
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the present application discloses a kind of digitlization power control circuit and method, wherein digitlization power control circuit includes: switching power circuit, voltage comparator circuit, voltage detecting circuit and microprocessor；First output end of the switching power circuit is connect with the input terminal of the first input end of the voltage comparator circuit and the voltage detecting circuit, second input terminal of the voltage comparator circuit is connected with the first input end of the microprocessor, and the output end of above-mentioned voltage comparator circuit is connect with the feedback control end of the switching power circuit.The output voltage for the reference voltage signal dynamic regulation switching power circuit that the embodiment of the present application can be exported by microprocessor, to promote the stability and precision of output voltage.
Description
Technical field
This application involves digitlization power control circuit technical field more particularly to a kind of digitlization power control circuit and
Method.
Background technique
Switching Power Supply is using modern power electronics technology, and the time ratio of control switch pipe conducting and disconnection remains steady
Determine a kind of power supply of output voltage, Switching Power Supply is generally by pulse width modulation (Pulse Width Modulation, PWM) control
Switching tube processed is constituted, such as positive exciting switching voltage regulator and reverse exciting switching voltage regulator.Have at present in middle low power Switching Power Supply market
It is widely applied；However, traditional Switching Power Supply is easy to be protected from environmental, output voltage precision is low, and stability is poor.
Summary of the invention
The embodiment of the present application provides a kind of digitlization power control circuit, can dynamic regulation output voltage, promoted output electricity
The precision and stability of pressure.
In a first aspect, the embodiment of the present application provides a kind of digitlization power control circuit, digitlization power supply control electricity
Road includes: switching power circuit, voltage comparator circuit, voltage detecting circuit and microprocessor；
The switching power circuit includes first input end, the second input terminal, the first output end, second output terminal and anti-
Control terminal is presented, the voltage comparator circuit includes first input end, the second input terminal and output end, the voltage detecting circuit packet
Input terminal and output end are included, the microprocessor includes first input end and the first output end；The of the switching power circuit
One output end is connect with the input terminal of the first input end of the voltage comparator circuit and the voltage detecting circuit, the electricity
Second input terminal of pressure comparison circuit is connected with the first input end of the microprocessor, the output end of above-mentioned voltage comparator circuit
It is connect with the feedback control end of the switching power circuit；
The switching power circuit, for the first input end and the second input terminal input source from the switching power circuit
Power supply signal, and signal is controlled from feedback control end input feedback, from the first output end of the switching power circuit
DC power signal is exported with second output terminal；The voltage detecting circuit, for the input terminal from the voltage detecting circuit
Real-time voltage signal on the first output end of the switching power circuit of input, it is defeated from the output end of the voltage detecting circuit
Exit port voltage signal；The microprocessor, the port voltage for being inputted from the first input end of the microprocessor
Signal, from the first output end output reference voltage signal of the microprocessor；The voltage comparator circuit is used for from the electricity
The real-time voltage signal and reference voltage letter that the first input end and the second input terminal of pressure comparison circuit input respectively
Number, the feedback control signal is exported from the output end of the voltage comparator circuit.
In a kind of optional embodiment, the voltage comparator circuit include: first capacitor, the first operational amplifier,
First resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance；
The output end of first operational amplifier is connect with the output end of the voltage comparator circuit, first operation
The normal phase input end of amplifier is connect with the first end of the first resistor and the second resistance first end, the first resistor
Second end connect with the first input end of the voltage comparator circuit, the second end of the second resistance is common ground end；
The inverting input terminal of first operational amplifier and first end, the first end and the 5th of the 4th resistance of the 3rd resistor
The first end of resistance connects, and the second end of the 3rd resistor is connect with the second input terminal of the voltage comparator circuit, described
The second end of 4th resistance is connect with the first end of the first capacitor, and the second end of the 5th resistance is the common ground
End；The second end of the capacitor is connect with the output end of first operational amplifier.
It is PWM reference voltage in the reference voltage signal of microprocessor output in a kind of optional embodiment
In the case where signal, the voltage comparator circuit further include: reference voltage filter circuit；
The reference voltage filter circuit includes: second operational amplifier, the second capacitor, the 6th resistance and the 7th resistance；
The second end of the output end of the second operational amplifier and the 3rd resistor, the second operational amplifier
Inverting input terminal and the connection of the first end of second capacitor, the of the second end of second capacitor and the 6th resistance
The connection of the first end of one end and the 7th resistance, the positive of the second end and the second operational amplifier of the 6th resistance are defeated
Enter end connection, the second end of the 7th resistance is connect with the second input terminal of the voltage comparator circuit.
In a kind of optional embodiment, the voltage detecting circuit includes third operational amplifier, the 8th resistance,
Nine resistance, the tenth resistance and eleventh resistor；
The output end of the third operational amplifier and the output end of the voltage detecting circuit and the 11st electricity
The first end of resistance connects, the inverting input terminal and the described tenth of the second end of the eleventh resistor and the operational amplifier
The first end of resistance connects, and the second end of the tenth resistance is connect with the common ground end, the third operational amplifier
Normal phase input end connect with the first end of the first end of the 8th resistance and the 9th resistance, the second of the 8th resistance
End is connect with the common ground end, and the second end of the 9th resistance is connect with the input terminal of the voltage detecting circuit.
It include shunt resistance, institute in the second output terminal of the switching power circuit in a kind of optional embodiment
State digitlization power control circuit further include: current detection circuit and switch protecting circuit；
The current detection circuit includes first input end, the second input terminal and output end, the switch protecting circuit packet
Input, output end and control terminal are included, the microprocessor further includes the second input terminal and second output terminal；
The first input end of the current detection circuit and the second output terminal of the switching power circuit and described point
The first end of leakage resistance connects, and the second input terminal of the current detection circuit is connect with the second end of the shunt resistance, institute
The output end for stating current detection circuit is connect with the second input terminal of the microprocessor；The input terminal of the switch protecting circuit
It is connected with the first output end of the switching power circuit, the output end of the switch protecting circuit and the voltage detecting circuit
Input terminal and load connection, the control terminal of the switch protecting circuit connect with the second output terminal of the microprocessor；
The current detection circuit, for the first input end by the shunt resistance and the current detection circuit
The real-time current signal on first output end of switching power circuit is inputted with the second input terminal, from the current detection circuit
Output end output port current signal；The microprocessor is also used to input from the second input terminal of the microprocessor
The port current signal controls signal from the second output terminal mouth of microprocessor output first switch；The switch is protected
Protection circuit controls signal for inputting the first switch from the control terminal, and the first switch control signal is for controlling
Conducting and Guan Duan between the input terminal and output end of the switch protecting circuit.
In a kind of optional embodiment, the microprocessor further includes parameter receiving port；
The parameter receiving port, for receiving parameter information number, the parameter signal includes target voltage signal, voltage
Poor threshold value, current threshold and upper electrical parameter；
The microprocessor, for according to the port voltage signal and the target voltage signal and the voltage difference
Threshold value exports the reference voltage signal from the first output end of the microprocessor；
The microprocessor, for according to the port current signal and the current threshold from the of the microprocessor
Two output ends export the first switch and control signal.
When the digitlization power control circuit powers on, the microprocessor, for according to the upper electrical parameter from institute
The second output terminal for stating microprocessor exports the second switch control signal, and the second switch control signal is for controlling institute
It states and is changed on state from off-state in preset duration between the input terminal of switch protecting circuit and output end.
In a kind of optional embodiment, the switch protecting circuit includes PMOS switch pipe；
The pole S of the PMOS switch pipe is connect with the input terminal of the switch protecting circuit, the pole D of the PMOS switch pipe
It is connect with the output end of the switch protecting circuit, the pole G of the PMOS switch pipe and the control terminal of the switch protecting circuit
Connection；
When the switching power circuit powers on, the microprocessor is extremely defeated specifically for the G to the PMOS switch pipe
Pulse width modulation (PWM) switch control signal out, the duty ratio of the pulse width modulation (PWM) switch control signal is in configuration
It is interior to be gradient to 0% from 100%；
When the switching power circuit powers on, the PMOS switch pipe, the arteries and veins for being exported according to the microprocessor
Width modulated PWM switch control signal is rushed to control in the setup time between the switching power circuit output end and load
On state is faded to by disconnection.
In the embodiment of the present application, the output voltage signal of switching power circuit, and root are acquired by feedback control circuit
According to the target voltage output reference voltage signal of collected output voltage signal and setting, then comparison circuit passes through switch electricity
The output voltage signal and reference voltage signal of source circuit generate feedback signal；Then ON-OFF control circuit is according to the feedback signal
Output first switch control signal carrys out the output voltage of regulating switch power circuit.By the embodiment of the present application it is logical can use it is soft
Part algorithm obtains reference voltage using the target voltage of collected output voltage and setting, carrys out dynamic regulation switching power circuit
Output voltage, improve the precision and stability of switch power source output voltage.
Second aspect, the embodiment of the present application provide a kind of digitlization power control method, this method comprises:
Acquire real-time output voltage；
Calculate the voltage difference of the real-time output voltage and target voltage；
Reference voltage is obtained according to the voltage difference and voltage difference threshold value, the reference voltage is used for and the real-time output
Voltage is compared to obtain feedback control signal, and the feedback control signal is for adjusting the real-time output voltage to described
Target voltage.
It is described that reference voltage packet is obtained according to the voltage difference and voltage difference threshold value in a kind of possible embodiment
It includes:
Step-length is adjusted according to the voltage difference and the voltage difference adjusting thresholds voltage；
The reference voltage is adjusted using following formula:
Vref-set=Vref+ΔVadj；
Wherein, Vref-setFor reference voltage adjusted；VrefFor the reference voltage before adjustment；ΔVadjFor the voltage tune
Synchronizing is long.
It is described to be adjusted according to the voltage difference and the voltage difference adjusting thresholds voltage in a kind of possible embodiment
Step-length includes:
In the case where the real-time voltage is greater than target voltage, if the voltage absolute value of the difference is less than first threshold,
Zero then is set by voltage adjusting step-length, if the voltage absolute value of the difference is greater than the first threshold, and less than second
Threshold value then increases the voltage by preset value and adjusts step-length, if the voltage absolute value of the difference is greater than institute's second threshold, controls
Digitlization power control circuit is in guard mode；
In the case where the real-time voltage is less than target voltage, if the voltage absolute value of the difference is less than first threshold,
Zero then is set by voltage adjusting step-length, if the voltage absolute value of the difference is greater than the first threshold, and less than second
Threshold value then reduces the voltage by preset value and adjusts step-length, if the voltage absolute value of the difference is greater than institute's second threshold, controls
Digitlization power control circuit is in guard mode.
In the embodiment of the present application, it by acquiring output voltage signal, and according to collected output voltage signal and sets
Reference voltage signal is calculated in fixed target voltage, then compares output voltage signal and reference voltage signal obtains feedback letter
Number；And output voltage is adjusted using feedback signal, reach target voltage.Software can be used by the embodiment of the present application
Algorithm obtains reference voltage using the target voltage of collected output voltage and setting, carrys out dynamic regulation switching power circuit
Output voltage improves the precision and stability of switch power source output voltage.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in embodiment description
Attached drawing is briefly described.
Fig. 1 is that the embodiment of the present application provides a kind of schematic diagram for digitizing power control circuit；
Fig. 2 is the schematic diagram of another digitlization power control circuit provided by the embodiments of the present application；
Fig. 3 is that a kind of inverse-excitation type provided by the embodiments of the present application digitizes power control circuit schematic diagram；
Fig. 4 is that a kind of positive activation type provided by the embodiments of the present application digitizes power control circuit schematic diagram；
Fig. 5 is a kind of structural schematic diagram of voltage comparator circuit disclosed in the embodiment of the present application；
Fig. 6 is the structural schematic diagram of another kind voltage comparator circuit disclosed in the embodiment of the present application；
Fig. 7 is a kind of structural schematic diagram of voltage detecting circuit disclosed in the embodiment of the present application；
Fig. 8 is a kind of schematic flow diagram for digitizing power control method provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only
Some embodiments of the present application, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
The description and claims of this application and term " first " in above-mentioned attached drawing, " second " etc. are for distinguishing
Different objects, are not use to describe a particular order.In addition, term " includes " and " having " and their any deformations, it is intended that
It is to cover and non-exclusive includes.Such as it contains process, system, product or the equipment of a series of steps or units and does not limit
In listed step or unit, but optionally further comprising the step of not listing or unit, or optionally further comprising for
Other intrinsic step or units of these processes, product or equipment.
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
It is contained at least one embodiment of the application.Each position in the description occur the phrase might not each mean it is identical
Embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art explicitly and
Implicitly understand, embodiment described herein can be combined with other embodiments.
It is that the embodiment of the present application provides a kind of schematic diagram for digitizing power control circuit, the digitlization referring to Fig. 1, Fig. 1
Power control circuit includes: switching power circuit 10, voltage comparator circuit 20, voltage detecting circuit 30 and microprocessor 40,
In:
The switching power circuit 10 includes first input end 11, the second input terminal 12, the output of the first output end 13, second
End 14 and feedback control end 15, the voltage comparator circuit 20 include first input end 21, the second input terminal 22 and output end
23, the voltage detecting circuit 30 include input terminal 31 and output end 32, the microprocessor 40 include first input 41 ends and
First output end 42；The first input end of first output end 13 and the voltage comparator circuit 20 of the switching power circuit 10
21 and the input terminal 31 of the voltage detecting circuit 30 connect, the second input terminal 22 of the voltage comparator circuit 20 and described
The first input end 41 of microprocessor 40 connects, the output end 23 of above-mentioned voltage comparator circuit 20 and the switching power circuit 10
Feedback control end 15 connect；
The switching power circuit 10, for the first input end 11 and the second input terminal from the switching power circuit 10
12 input source power supply signals, and signal is controlled from 15 input feedback of feedback control end, from the switching power circuit 10
The first output end 13 and second output terminal 14 export DC power signal；The voltage detecting circuit 30 is used for from the electricity
The real-time voltage signal on 10 first output end 13 of the switching power circuit for pressing the input terminal 31 of detection circuit 30 to input, from
The 32 output port voltage signal of output end of the voltage detecting circuit 30；The microprocessor 40 is used for from the micro process
The port voltage signal that the first input end 41 of device 40 inputs exports from the first output end 42 of the microprocessor 40 and joins
Examine voltage signal；The voltage comparator circuit 20, it is defeated for the first input end 21 and second from the voltage comparator circuit 20
Enter the real-time voltage signal and the reference voltage signal that end 22 inputs respectively, from the output of the voltage comparator circuit 20
The 23 output feedback control signal of end.Wherein, above-mentioned source current signal can be ac supply signal, such as alternating current；It can also
To be DC power signal.
In the embodiment of the present application, microprocessor 40 acquires the real-time electricity of switching power circuit 10 by voltage detecting circuit 30
The output reference voltage of signal and target voltage signal is pressed, and by 20 comparison reference electric signal of voltage comparator circuit and electric in real time
Pressure signal provides feedback control signal, reaches target voltage signal with the real-time voltage signal that control switch power circuit 10 exports
Value, thus realize the reference voltage signal dynamic regulation switching power circuit 10 exported by microprocessor 40 output electricity
Pressure, improves the stability and precision of output voltage.
Referring to fig. 2, Fig. 2 is the schematic diagram of another digitlization power control circuit provided by the embodiments of the present application, the number
Word power control circuit includes: switching power circuit 10, voltage comparator circuit 20, voltage detecting circuit 30, current detecting electricity
Road 60, switch protecting circuit 50 and microprocessor 40, in which:
The switching power circuit 10 includes first input end 11, the second input terminal 12, the output of the first output end 13, second
14 ends and feedback control end 15, the voltage comparator circuit 20 include first input end 21, the second input terminal 22 and output end
23, the voltage detecting circuit 30 includes input terminal and output end, and the microprocessor 40 includes first defeated 41 entering end, second defeated
Enter end 43, the first output end 42 and second output terminal 44；The current detection circuit 60 is inputted including first input end 61, second
End 62 and output end 63, the switch protecting circuit 50 include input terminal 51, output end 52 and control terminal 53.
First output end 13 of the switching power circuit and the first input end 21 of the voltage comparator circuit 20 and
The input terminal 31 of the voltage detecting circuit 30 connects, the second input terminal 22 of the voltage comparator circuit 20 and the micro process
The first input end 41 of device 40 connects, the feedback control of the output end 23 and the switching power circuit of above-mentioned voltage comparator circuit 20
End 15 processed connects；The second output terminal 14 of the first input end 61 of the current detection circuit 60 and the switching power circuit 10
And the first end connection of the shunt resistance, the second input terminal 62 and the shunt resistance of the current detection circuit 60
Second end connection, the output end of the current detection circuit 60 are connect with the second input terminal 43 of the microprocessor 40；It is described
The first output end 13 connection of the input terminal 51 and the switching power circuit of switch protecting circuit 50, the switch protecting circuit
The input terminal 31 and load of 50 output end 52 and the voltage detecting circuit 30 connect, the control of the switch protecting circuit 50
End 53 processed is connect with the second output terminal 44 of the microprocessor 40.
The switching power circuit 10, for the first input end 11 and the second input terminal from the switching power circuit 10
12 input source power supply signals, and signal is controlled from 15 input feedback of feedback control end, from the switching power circuit 10
The first output end 13 and second output terminal 14 export DC power signal；The voltage detecting circuit 30 is used for from the electricity
The real-time voltage signal on 10 first output end 13 of the switching power circuit for pressing the input terminal 31 of detection circuit 30 to input, from
The 32 output port voltage signal of output end of the voltage detecting circuit 30；The microprocessor 40 is used for from the micro process
The port voltage signal that the first input end 41 of device 40 inputs exports from the first output end 42 of the microprocessor 40 and joins
Examine voltage signal；The voltage comparator circuit 20, for the first input end 2121 and second from the voltage comparator circuit 20
The real-time voltage signal and the reference voltage signal that input terminal 22 inputs respectively, from the defeated of the voltage comparator circuit 20
Outlet 23 exports the feedback control signal.The current detection circuit 60, for passing through the shunt resistance and the electricity
The first input end 61 and the second input terminal of current detection circuit 60 input on 10 first output end 13 of switching power circuit
Real-time current signal, from the output end output port current signal of the current detection circuit 60；The microprocessor 40, is also used
In the port current signal inputted from the second input terminal 43 of the microprocessor 40, from the second of the microprocessor 40
44 mouthfuls of output first switches of output end control signal；The switch protecting circuit 50, for from control terminal input described the
One switch control signal, the first switch control signal are used to control input terminal 51 and the output of the switch protecting circuit 50
Conducting and Guan Duan between end.
As shown in Fig. 2, above-mentioned switching power circuit 10 is by the source current signal V of inputiBe converted to real-time voltage signal VoIt is defeated
Out, so that load uses.After above-mentioned switching power circuit 10 has signal output, above-mentioned voltage detecting circuit 30 will be from above-mentioned
The real-time voltage signal V of the first output end output of switching power circuit 10oBe converted to port voltage signal Vp-vol.Then above-mentioned
Microprocessor 40 is according to preset target voltage Vo-setWith above-mentioned port voltage signal Vp-volCalculate the value of reference voltage signal
Vref-set, then above-mentioned microprocessor 40 is according to Vref-setAbove-mentioned reference is exported from the first output end 42 of above-mentioned microprocessor 40
Voltage signal Vref.Then above-mentioned voltage comparator circuit 20 is according to VoAnd VrefExport above-mentioned feedback control signal P.It is finally above-mentioned to open
The V that powered-down source circuit 10 exports above-mentioned switching power circuit 10 according to feedback control signal PoIt adjusts to Vo-set.In addition, when micro-
The port current signal I that processor 40 is obtained according to above-mentioned current detection circuit 60p-curAnd preset current threshold
Io-thresholdDetermine Ip-cur>Io-thresholdWhen, then by the second output terminal 44 of microprocessor 40 as above-mentioned switch protecting circuit
50 send third switch control signal, are in an off state above-mentioned switch protecting circuit 50, i.e. disconnection Switching Power Supply and load
Between connection so that above-mentioned system digitlization power control circuit be in guard mode.
Wherein, above-mentioned microprocessor 40 is according to preset target voltage Vo-setWith above-mentioned port voltage signal Vp-volIt calculates
The value V of reference voltage signalref-setCan specifically include: above-mentioned is processor according to Vp-volCalculate Vo-setAnd VoVoltage difference delta
V.Then determine that voltage adjusts step-length according to the voltage difference and the voltage difference threshold value；Then using described in following formula adjustment
Reference voltage:
Vref-set=Vref+ΔVadj；
Wherein, Vref-setFor reference voltage adjusted；VrefFor the reference voltage before adjustment；ΔVadjFor the voltage tune
Synchronizing is long.
In the embodiment of the present application, described that step-length tool is adjusted according to the voltage difference and the voltage difference adjusting thresholds voltage
Body may include:
Work as Vo-set<VoWhen, if | Δ V | < Δ Vo-threshold-1, it is determined that Δ Vadj=0；If Δ Vo-threshold-1<|ΔV|<
ΔVo-threshold-2, then increase Δ V by preset valueadjIf | Δ V | > Δ Vo-threshold-2, then digital control power control circuit
In guard mode；
Work as Vo-set>VoWhen, if | Δ V | < Δ Vo-threshold-1, it is determined that Δ Vadj=0；If Δ Vo-threshold-1<|ΔV|<
ΔVo-threshold-2, then reduce Δ V by preset valueadjIf | Δ V | > Δ Vo-threshold-2, then digital control power control circuit
In guard mode.
Wherein, Δ V is real-time voltage signal VoWith target voltage signal Vo-setVoltage difference, Δ Vo-threshold-1It is first
Voltage difference threshold value, Δ Vo-threshold-2For second voltage difference threshold value.
In the embodiment of the present application, above-mentioned switching power circuit 10 can be positive exciting switching voltage regulator circuit 10, be also possible to
Reverse exciting switching voltage regulator circuit 10.As shown in Figure 3 or Figure 4, Fig. 3 is that a kind of inverse-excitation type provided by the embodiments of the present application digitizes power supply
Control circuit schematic diagram, Fig. 4 are that a kind of positive activation type provided by the embodiments of the present application digitizes power control circuit schematic diagram.
Switching power circuit 10 includes optocoupler 1001 in inverse-excitation type digitlization power control circuit as shown in Figure 3
With switching power source chip 1002 and switch transistor T 1.Above-mentioned switching power source chip 1002 is used to export the above-mentioned switch transistor T 1 of control
PWM switch control signal.Wherein, the duty ratio of the PWM switch control signal and the output of above-mentioned switching power circuit are electric in real time
Pressure is related.Specifically, when above-mentioned switch transistor T 1 is NMOS tube, it is above-mentioned if the duty ratio of the PWM switch control signal is higher
The voltage value of the real-time voltage of Switching Power Supply output is higher.Above-mentioned optocoupler 1001 is used for above-mentioned voltage comparator circuit 20 is defeated
Feedback control signal out is transferred to switching power source chip 1002.Above-mentioned feedback control signal is for controlling above-mentioned Switching Power Supply core
The PWM switch control signal of the defeated different accountings of piece 1002.
Specifically, when above-mentioned switch transistor T 1 is NMOS tube, when above-mentioned feedback control signal is high level, above-mentioned optocoupler
Device 1001 is connected, and for above-mentioned optocoupler 1001 to above-mentioned 1002 input low level signal of switching power source chip, above-mentioned switch is electric
Source chip 1002 increases the duty ratio of the PWM switch control signal of output, to increase what above-mentioned switching power circuit 10 exported
The voltage value of real-time voltage signal.When above-mentioned feedback control signal is low level, above-mentioned optocoupler 1001 ends, above-mentioned light
Coupling device 1001 reduces output to above-mentioned 1002 input high level signal of switching power source chip, above-mentioned switching power source chip 1002
The duty ratio of PWM switch control signal, to reduce the voltage value for the real-time voltage signal that above-mentioned switching power circuit 10 exports.
Switching power circuit 10 includes optocoupler 1001 in positive activation type digitlization power control circuit as shown in Figure 4
With switching power source chip 1002 and switch transistor T 1.Above-mentioned switching power source chip 1002 is used to export the above-mentioned switch transistor T 1 of control
PWM switch control signal.Wherein, the duty ratio of the PWM switch control signal and the output of above-mentioned switching power circuit are electric in real time
Pressure is related.Specifically, when above-mentioned switch transistor T 1 is NMOS tube, it is above-mentioned if the duty ratio of the PWM switch control signal is higher
The voltage value of the real-time voltage of Switching Power Supply output is higher.Above-mentioned optocoupler 1001 is used for above-mentioned voltage comparator circuit 20 is defeated
Feedback control signal out is transferred to switching power source chip 1002.Above-mentioned feedback control signal is for controlling above-mentioned Switching Power Supply core
The PWM switch control signal of the defeated different accountings of piece 1002.
Specifically, when above-mentioned switch transistor T 1 is NMOS tube, when above-mentioned feedback control signal is high level, above-mentioned optocoupler
Device 1001 is connected, and for above-mentioned optocoupler 1001 to above-mentioned 1002 input low level signal of switching power source chip, above-mentioned switch is electric
Source chip 1002 increases the duty ratio of the PWM switch control signal of output, to increase what above-mentioned switching power circuit 10 exported
The voltage value of real-time voltage signal.When above-mentioned feedback control signal is low level, above-mentioned optocoupler 1001 ends, above-mentioned light
Coupling device 1001 reduces output to above-mentioned 1002 input high level signal of switching power source chip, above-mentioned switching power source chip 1002
The duty ratio of PWM switch control signal, to reduce the voltage value for the real-time voltage signal that above-mentioned switching power circuit 10 exports.
In the embodiment of the present application, microprocessor 40 acquires the real-time electricity of switching power circuit 10 by voltage detecting circuit 30
Press the output reference voltage of signal and preset target voltage signal, and by 20 comparison reference electric signal of voltage comparator circuit and
Real-time voltage signal provides feedback control signal, reaches target electricity with the real-time voltage signal that control switch power circuit 10 exports
The value for pressing signal, to realize the reference voltage signal dynamic regulation switching power circuit 10 exported by microprocessor 40
Output voltage improves the stability and precision of output voltage.
In a kind of optional embodiment, when the first output end 42 of above-mentioned microprocessor 40 is digital analog converter
In the case where the port (Digital to analog converter, DAC), the specific structure of the voltage comparator circuit 20 with
It is illustrated for Fig. 5.It is a kind of structural representation of voltage comparator circuit 20 disclosed in the embodiment of the present application refering to Fig. 5, Fig. 5
Figure.The voltage comparator circuit 20 include: first capacitor C1, the first operational amplifier U1, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4 and the 5th resistance R5；
The output end of the first operational amplifier U1 is connect with the output end 23 of the voltage comparator circuit 20, and described
The normal phase input end of one operational amplifier U1 is connect with the first end of the first resistor R1 and the second resistance R2 first end,
The second end of the first resistor R1 is connect with the first input end 21 of the voltage comparator circuit 20, the second resistance R2's
Second end is common ground end；The inverting input terminal of the first operational amplifier U1 and the first end of the 3rd resistor R3,
The first end of 4th resistance R4 and the first end connection of the 5th resistance R5, the second end of the 3rd resistor R3 and the voltage
Second input terminal 22 of comparison circuit 20 connects, and the second end of the 4th resistance R4 and the first end of the first capacitor C1 connect
It connects, the second end of the 5th resistance R5 is the common ground end；The second end of the capacitor and first operation amplifier
The output end of device U1 connects.
Wherein, the output of the first output end 42 output of microprocessor 40 are as follows:
Wherein, VrefFor the reference voltage signal that microprocessor 40 is exported according to target voltage signal, VDAC-setFor target electricity
Press signal Vo-setAnalog-to-digital conversion (Analog-to-Digital Converter, ADC) after value, VDDAFor digital-to-analogue conversion setting
Maximum value it is corresponding simulation model supply voltage, VDAC-maxFor the maximum value of digital-to-analogue conversion setting.
According to above-mentioned voltage comparator circuit 20, it is known that the voltage of the first input end of the first operational amplifier U1 are as follows:
The voltage of the second input terminal of first operational amplifier U1 are as follows:
Wherein, VoFor real-time voltage signal, VrefFor reference voltage signal.
Work as V11>V12When, above-mentioned voltage comparator circuit 20 exports high level feedback control signal, works as V11<V12When, above-mentioned electricity
Comparison circuit 20 is pressed to export low level feedback control signal.
In a kind of optional embodiment, when the reference voltage signal of the microprocessor 40 output is PWM with reference to electricity
In the case where pressing signal, the specific structure of the voltage comparator circuit 20 is illustrated by taking Fig. 6 as an example.It is this refering to Fig. 6, Fig. 6
Apply for the structural schematic diagram of another kind voltage comparator circuit 20 disclosed in embodiment.As shown in fig. 6, the voltage comparator circuit 20
Further include: reference voltage filter circuit.The reference voltage filter circuit include: second operational amplifier U2, the second capacitor C2,
6th resistance R6 and the 7th resistance R7.
Second end, the second operational amplifier of the output end of the second operational amplifier and the 3rd resistor R3
Inverting input terminal and the second capacitor C2 first end connection, the second end of the second capacitor C2 and it is described 6th electricity
It hinders the first end of R6 and the first end connection of the 7th resistance R7, second end and second operation of the 6th resistance R6 is put
The normal phase input end connection of big device, the second end of the 7th resistance R7 and the second input terminal 22 of the voltage comparator circuit 20
Connection.
Wherein, the PWM reference voltage signal V of the first output end 42 output of microprocessor 40ref-pwm, pass through duty ratio tune
Duty ratio is saved to adjust the voltage magnitude of reference voltage.It is specifically F by frequencypwmVref-pwmAfter above-mentioned filter circuit,
It is F by frequencypwmSignal become d. c. voltage signal, i.e., output DC reference voltage signal Vref.Reference voltage signal VrefIt can
With are as follows:
Vref=D*VCC；
Wherein, D Vref-pwmDuty ratio, VCC Vref-pwmHigh level voltage；In addition FpwmValue range can be
10K<Fpwm<100K。
According to above-mentioned voltage comparator circuit 20, it is known that the voltage of the first input end of the first operational amplifier U1 are as follows:
The voltage of the second input terminal of first operational amplifier U1 are as follows:
Wherein, VoFor real-time voltage signal, VrefFor reference voltage signal.
Work as V11>V12When, above-mentioned voltage comparator circuit 20 exports high level feedback control signal, works as V11<V12When, above-mentioned electricity
Comparison circuit 20 is pressed to export low level feedback control signal.
In a kind of optional embodiment, the specific structure of the voltage detecting circuit 30 is illustrated by taking Fig. 7 as an example.
As shown in fig. 7, the voltage detecting circuit 30 includes third operational amplifier U3, the 8th resistance R8, the 9th resistance R9, the tenth electricity
Hinder R10 and eleventh resistor R11；
The output end of the third operational amplifier U3 and the output end 32 of the voltage detecting circuit 30 and described the
The first end of 11 resistance R11 connects, the second end of the eleventh resistor R11 and the inverting input terminal of the operational amplifier
And the first end connection of the tenth resistance R10, the second end of the tenth resistance R10 are connect with the common ground end,
The first of the normal phase input end of the third operational amplifier U3 and the first end of the 8th resistance R8 and the 9th resistance R9
End connection, the second end of the 8th resistance R8 are connect with the common ground end, the second end of the 9th resistance R9 and institute
The input terminal 31 for stating voltage detecting circuit 30 connects.
Voltage detecting circuit 30 according to figure 7, can see that
Wherein, VoFor real-time voltage signal, Vp-volFor port voltage signal.
In a kind of optional embodiment, the above-mentioned microprocessor 40 shown in Fig. 2 further includes parameter receiving port；
The parameter receiving port, for receiving above-mentioned target voltage signal, voltage difference threshold value and current threshold.It is described to make
Microprocessor 40 according to the port voltage signal and the target voltage signal and the voltage difference threshold value from it is described it is micro- from
First output end 42 of reason device 40 exports the reference voltage signal；Or make the microprocessor 40 according to the port electricity
Stream signal and the current threshold export the first switch from the second output terminal 44 of the microprocessor 40 and control signal.
In the embodiment of the present application, above-mentioned parameter receiving port can be also used for receiving electrical parameter.When the digitlization
When power control circuit powers on, the microprocessor 40 is according to the upper electrical parameter from the second output terminal of the microprocessor 40
The 44 output second switches control signal, and the second switch control signal is for controlling the defeated of the switch protecting circuit 50
Enter and is changed on state from off-state in preset duration between end 51 and output end.
Specifically, as shown in Figure 3 or Figure 4, the switch protecting circuit 50 includes PMOS switch pipe；The PMOS switch pipe
The pole S connect with the input terminal 51 of the switch protecting circuit 50, the pole D of the PMOS switch pipe and the switch protecting circuit
50 output end 52 connects, and the pole G of the PMOS switch pipe is connect with the control terminal 53 of the switch protecting circuit 50.
When the switching power circuit 10 powers on, the microprocessor 40, specifically for the G to the PMOS switch pipe
Pole output pulse width modulation (PWM) switch control signal, the duty ratio of the pulse width modulation (PWM) switch control signal are being matched
It sets in the time and is gradient to 0% from 100%.When the switching power circuit 10 powers on, the PMOS switch pipe is according to described micro-
The pulse width modulation (PWM) switch control signal that processor 40 exports controls the switching power circuit within the setup time
On state is faded to by disconnection between 10 output ends and load.
In the embodiment of the present application, the output voltage signal of switching power circuit 10 is acquired by feedback control circuit, and
According to the target voltage output reference voltage signal of collected output voltage signal and setting, then comparison circuit passes through switch
The output voltage signal and reference voltage signal of power circuit 10 generate feedback signal；Then ON-OFF control circuit is according to the feedback
Signal output first switch control signal carrys out the output voltage of regulating switch power circuit 10.By the embodiment of the present application is logical can be with
Reference voltage is obtained using the target voltage of collected output voltage and setting using software algorithm, carrys out dynamic regulation switch electricity
The output voltage of source circuit improves the precision and stability of switch power source output voltage.
Referring to Fig. 8, Fig. 8 is a kind of schematic flow diagram for digitizing power control method provided by the embodiments of the present application, should
Method includes:
The digitlization power control method of the embodiment of the present application decorum can be applied to number shown in above-mentioned Fig. 1 to Fig. 4
Change power control circuit.
801: acquiring real-time output voltage.
In the embodiment of the present application, above-mentioned true output voltage is the real-time voltage that switch power supply road direction loads out.It can
To acquire the real-time voltage of above-mentioned switching power circuit output by voltage comparator circuit, then collected real-time voltage is passed
It is defeated by microprocessor.
802: calculating the voltage difference of the real-time output voltage and target voltage.
In the embodiment of the present application, above-mentioned target voltage can be the load institute that user is sent by terminal to microprocessor
The voltage value needed, is also possible to the preset voltage value saved in microprocessor.
803: reference voltage is obtained according to the voltage difference and voltage difference threshold value, the reference voltage be used for and it is described in real time
Output voltage is compared to obtain feedback control signal, the feedback control signal be used to adjust the real-time output voltage to
The target voltage.
In the embodiment of the present application, above-mentioned voltage difference threshold value can be the setting that user is sent by terminal to microprocessor
Value, is also possible to the preset value saved in microprocessor.
Specifically, after above-mentioned microprocessor calculates above-mentioned voltage difference, then according to the voltage difference and the voltage difference
Adjusting thresholds voltage adjusts step-length；Then the reference voltage is calculated using following formula:
Vref-set=Vref+ΔVadj；
Wherein, Vref-setFor reference voltage adjusted；VrefFor the reference voltage before adjustment；ΔVadjFor the voltage tune
Synchronizing is long.
It is described to be adjusted according to the voltage difference and the voltage difference adjusting thresholds voltage in a kind of possible embodiment
Step-length can specifically include:
In the case where the real-time voltage is greater than target voltage, if the voltage absolute value of the difference is less than first threshold,
Then microprocessor sets zero for voltage adjusting step-length, if the voltage absolute value of the difference is greater than the first threshold, and
Less than second threshold, then microprocessor increases the voltage adjusting step-length by preset value, if the voltage absolute value of the difference is greater than
Institute's second threshold, then microprocessor digital control power control circuit is in guard mode；
In the case where the real-time voltage is less than target voltage, if the voltage absolute value of the difference is less than first threshold,
Zero then is set by voltage adjusting step-length, if the voltage absolute value of the difference is greater than the first threshold, and less than second
Threshold value then reduces the voltage by preset value and adjusts step-length, if the voltage absolute value of the difference is greater than institute's second threshold, controls
Digitlization power control circuit is in guard mode.
Wherein, above-mentioned guard mode refers to that microprocessor sends switch control signal, so as to control switch power supply and load
Between be in an off state.
In the embodiment of the present application, it by acquiring output voltage signal, and according to collected output voltage signal and sets
Reference voltage signal is calculated in fixed target voltage, then compares output voltage signal and reference voltage signal obtains feedback letter
Number；And output voltage is adjusted using feedback signal, reach target voltage.Software can be used by the embodiment of the present application
Algorithm obtains reference voltage using the target voltage of collected output voltage and setting, carrys out dynamic regulation switching power circuit
Output voltage improves the precision and stability of switch power source output voltage.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should all cover within the scope of protection of this application.Therefore, the protection scope of the application should be with right
It is required that protection scope subject to.
Claims (10)
1. a kind of digitlization power control circuit, which is characterized in that the digitlization power control circuit includes: switch power supply
Road, voltage comparator circuit, voltage detecting circuit and microprocessor；
The switching power circuit includes first input end, the second input terminal, the first output end, second output terminal and feedback control
End processed, the voltage comparator circuit include first input end, the second input terminal and output end, and the voltage detecting circuit includes defeated
Enter end and output end, the microprocessor includes first input end and the first output end；The first of the switching power circuit is defeated
Outlet is connect with the input terminal of the first input end of the voltage comparator circuit and the voltage detecting circuit, the voltage ratio
The second input terminal compared with circuit is connected with the first input end of the microprocessor, the output end of above-mentioned voltage comparator circuit and institute
State the feedback control end connection of switching power circuit；
The switching power circuit, for the first input end and the second input terminal input source current from the switching power circuit
Signal, and control signal from feedback control end input feedback, from the first output end of the switching power circuit and the
Two output ends export DC power signal；The voltage detecting circuit, for being inputted from the input terminal of the voltage detecting circuit
The first output end of the switching power circuit on real-time voltage signal, from the output end output end of the voltage detecting circuit
Mouth voltage signal；The microprocessor, the port voltage signal for being inputted from the first input end of the microprocessor,
From the first output end output reference voltage signal of the microprocessor；The voltage comparator circuit is used for from the voltage ratio
Compared with the real-time voltage signal and the reference voltage signal that the first input end of circuit and the second input terminal input respectively, from
The output end of the voltage comparator circuit exports the feedback control signal.
2. digitlization power control circuit according to claim 1, which is characterized in that the voltage comparator circuit includes:
First capacitor, the first operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance；
The output end of first operational amplifier is connect with the output end of the voltage comparator circuit, first operation amplifier
The normal phase input end of device is connect with the first end of the first resistor and the second resistance first end, and the of the first resistor
Two ends are connect with the first input end of the voltage comparator circuit, and the second end of the second resistance is common ground end；It is described
First end, the first end and the 5th resistance of the 4th resistance of the inverting input terminal of first operational amplifier and the 3rd resistor
First end connection, the second end of the 3rd resistor connect with the second input terminal of the voltage comparator circuit, the described 4th
The second end of resistance is connect with the first end of the first capacitor, and the second end of the 5th resistance is the common ground end；
The second end of the capacitor is connect with the output end of first operational amplifier.
3. digitlization power control circuit according to claim 2, which is characterized in that in the ginseng of microprocessor output
In the case where voltage signal is examined as PWM reference voltage signal, the voltage comparator circuit further include: reference voltage filter circuit；
The reference voltage filter circuit includes: second operational amplifier, the second capacitor, the 6th resistance and the 7th resistance；
Second end, the reverse phase of the second operational amplifier of the output end of the second operational amplifier and the 3rd resistor
The connection of the first end of input terminal and second capacitor, the second end of second capacitor and the first end of the 6th resistance
And the 7th resistance first end connection, the normal phase input end of the second end of the 6th resistance and the second operational amplifier
Connection, the second end of the 7th resistance are connect with the second input terminal of the voltage comparator circuit.
4. digitlization power control circuit according to claim 1-3, which is characterized in that the voltage detecting electricity
Road includes third operational amplifier, the 8th resistance, the 9th resistance, the tenth resistance and eleventh resistor；
The output end of the third operational amplifier and the output end of the voltage detecting circuit and the eleventh resistor
First end connection, the inverting input terminal and the tenth resistance of the second end of the eleventh resistor and the operational amplifier
First end connection, the second end of the tenth resistance connect with the common ground end, and the third operational amplifier is just
Phase input terminal is connect with the first end of the first end of the 8th resistance and the 9th resistance, the second end of the 8th resistance with
The common ground end connection, the second end of the 9th resistance are connect with the input terminal of the voltage detecting circuit.
5. digitlization power control circuit according to claim 4, which is characterized in that the second of the switching power circuit
It include shunt resistance, the digitlization power control circuit further include: current detection circuit and switch protecting circuit on output end；
The current detection circuit includes first input end, the second input terminal and output end, and the switch protecting circuit includes defeated
Enter end, output end and control terminal, the microprocessor further includes the second input terminal and second output terminal；
The second output terminal and shunting electricity of the first input end of the current detection circuit and the switching power circuit
The first end of resistance connects, and the second input terminal of the current detection circuit is connect with the second end of the shunt resistance, the electricity
The output end of current detection circuit is connect with the second input terminal of the microprocessor；The input terminal of the switch protecting circuit and institute
The first output end connection of switching power circuit is stated, the output end of the switch protecting circuit is defeated with the voltage detecting circuit
Enter end and load connection, the control terminal of the switch protecting circuit are connect with the second output terminal of the microprocessor；
The current detection circuit, for the first input end and the by the shunt resistance and the current detection circuit
Two input terminals input the real-time current signal on first output end of switching power circuit, from the defeated of the current detection circuit
Outlet output port current signal；The microprocessor is also used to from described in the input of the second input terminal of the microprocessor
Port current signal controls signal from the second output terminal mouth of microprocessor output first switch；The switch protection electricity
Road controls signal for inputting the first switch from the control terminal, and the first switch control signal is described for controlling
Conducting and Guan Duan between the input terminal and output end of switch protecting circuit.
6. digitlization power control circuit according to claim 5, which is characterized in that the microprocessor further includes parameter
Receiving port；
The parameter receiving port, for receiving parameter information number, the parameter signal includes target voltage signal, voltage difference threshold
Value, current threshold and upper electrical parameter；
The microprocessor, for according to the port voltage signal and the target voltage signal and the voltage difference threshold value
The reference voltage signal is exported from the first output end of the microprocessor；
The microprocessor, for defeated from the second of the microprocessor according to the port current signal and the current threshold
Outlet exports the first switch and controls signal；
When the digitlization power control circuit powers on, the microprocessor, for according to the upper electrical parameter from described micro-
The second output terminal of processor exports the second switch and controls signal, and the second switch control signal is for controlling described open
It closes and is changed on state from off-state in preset duration between the input terminal and output end of protection circuit.
7. digitlization power control circuit according to claim 6, which is characterized in that the switch protecting circuit includes
PMOS switch pipe；
The pole S of the PMOS switch pipe is connect with the input terminal of the switch protecting circuit, the pole D of the PMOS switch pipe and institute
The output end connection of switch protecting circuit is stated, the pole G of the PMOS switch pipe is connect with the control terminal of the switch protecting circuit；
When the switching power circuit powers on, the microprocessor, specifically for exporting arteries and veins to the pole G of the PMOS switch pipe
Width modulated PWM switch control signal is rushed, the duty ratio of the pulse width modulation (PWM) switch control signal is within setup time
0% is gradient to from 100%；
When the switching power circuit powers on, the PMOS switch pipe, the pulse for being exported according to the microprocessor is wide
Degree modulation (PWM) switch control signal is being controlled between the switching power circuit output end and load in the setup time by breaking
It opens and fades on state.
8. a kind of digitlization power control method characterized by comprising
Acquire real-time output voltage；
Calculate the voltage difference of the real-time output voltage and target voltage；
Reference voltage is obtained according to the voltage difference and voltage difference threshold value, the reference voltage is used for and the real-time output voltage
It is compared to obtain feedback control signal, the feedback control signal is for adjusting the real-time output voltage to the target
Voltage.
9. according to the method described in claim 8, it is characterized in that, described joined according to the voltage difference and voltage difference threshold value
Examining voltage includes:
Step-length is adjusted according to the voltage difference and the voltage difference adjusting thresholds voltage；
The reference voltage is adjusted using following formula:
Vref-set=Vref+ΔVadj；
Wherein, Vref-setFor reference voltage adjusted；VrefFor the reference voltage before adjustment；ΔVadjIt adjusts and walks for the voltage
It is long.
10. according to the method described in claim 9, it is characterized in that, described according to the voltage difference and the voltage difference threshold value
Adjustment voltage adjusts step-length
It, will if the voltage absolute value of the difference is less than first threshold in the case where the real-time voltage is greater than target voltage
The voltage adjusts step-length and is set as zero, if the voltage absolute value of the difference is greater than the first threshold, and is less than second threshold,
Then increase the voltage by preset value and adjust step-length, if the voltage absolute value of the difference is greater than institute's second threshold, controls number
Change power control circuit and is in guard mode；
It, will if the voltage absolute value of the difference is less than first threshold in the case where the real-time voltage is less than target voltage
The voltage adjusts step-length and is set as zero, if the voltage absolute value of the difference is greater than the first threshold, and is less than second threshold,
Then reduce the voltage by preset value and adjust step-length, if the voltage absolute value of the difference is greater than institute's second threshold, controls number
Change power control circuit and is in guard mode.
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