CN105048815B - A kind of output voltage regulation circuit and power supply - Google Patents
A kind of output voltage regulation circuit and power supply Download PDFInfo
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- CN105048815B CN105048815B CN201510224744.6A CN201510224744A CN105048815B CN 105048815 B CN105048815 B CN 105048815B CN 201510224744 A CN201510224744 A CN 201510224744A CN 105048815 B CN105048815 B CN 105048815B
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Abstract
The embodiment of the present invention, which provides a kind of output voltage regulation circuit and power supply, the output voltage regulation circuit, to be included, loop of power circuit circuit, voltage sampling circuit, for gathering the voltage signal of input；Voltage regulator circuit, for receiving the voltage signal of input, compare the voltage signal of input and the size of default reference voltage signal, obtain preconditioning voltage signal；Voltage detecting feedback circuit, for receiving the output voltage signal of preconditioning voltage signal and loop of power circuit circuit, and compare the size of preconditioning voltage signal and output voltage signal, obtain target regulated voltage signal；Control circuit, for receiving target regulated voltage signal, and according to the output voltage of target regulated voltage Signal Regulation control loop of power circuit circuit, ensure output voltage stabilization.Power supply uses output voltage regulation circuit, while can also reaching raising power-efficient, ensures output voltage stabilization.
Description
Technical field
The application is related to circuit field, more specifically to a kind of output voltage regulation circuit and power supply
Background technology
With the continuous development of the communication technology, communication power supply generally requires to work under severe working environment, therefore, right
The power requirement more and more higher of communication power supply busbar modules, actual demand can be met in order to reach output voltage, in the prior art,
The efficiency of communication power supply busbar modules can be improved by transformer turns ratio reasonable in design.
However, after being designed according to transformer turns ratio, although can be optimal communication power supply busbar modules efficiency,
But it is optimal due to transformer turns ratio being designed to, it result in the dutycycle of power source bus module under conditions of nominal input voltage
Have been maxed out, so as to keep maximum constant with the dutycycle of the reduction of input voltage, power source bus module, and export electricity
Pressure can then reduce with the reduction of input voltage, cause power module and be operated in open loop situations, and output voltage can not
Within the certain accuracy rating of voltage stabilizing, or even the output voltage of the communication power supply busbar modules when input voltage mutation occurs
Beyond the input voltage range of rear level power supply, and then there is the phenomenon of damage late-class circuit.At present, power supply producer, which does not have, is carrying
Solves the unstable technical scheme of output voltage under conditions of high busbar modules whole efficiency.
Therefore, how to realize that improving output voltage precision and stability is under conditions of busbar modules whole efficiency is improved
The technical problem of urgent need to resolve.
The content of the invention
In order to solve the above-mentioned technical problem, the embodiment of the present application provides a kind of output voltage regulation circuit, to realize
Output voltage stabilization is kept while improving power-efficient.
To achieve the above object, the embodiment of the present invention provides a kind of output voltage regulation circuit, including, loop of power circuit electricity
Road, feedback control loop, the feedback control loop include：
Voltage sampling circuit, the input of the voltage sampling circuit are connected with the input of the loop of power circuit circuit,
For gathering the voltage signal of input；
Voltage regulator circuit, the input of the voltage regulator circuit are connected with the output end of the voltage sampling circuit,
For receiving the size of the voltage signal of the input, the voltage signal of the input and default reference voltage signal,
And the reference voltage signal of the feedback control loop is exported according to comparative result；
Voltage detecting feedback circuit, the input of the voltage detecting feedback circuit and the output of the voltage regulator circuit
End and the output end of the loop of power circuit circuit are connected, for receiving the reference voltage signal of the feedback control loop and described
The output voltage signal of loop of power circuit circuit, and believed according to the reference voltage signal of the feedback control loop and the output voltage
Number generation target output voltage signal；
Control circuit, the output end of the control circuit respectively with the output end of the voltage detecting feedback circuit and described
The input of loop of power circuit circuit is connected, for receiving the target output voltage signal, and according to the target output voltage
The output voltage of loop of power circuit circuit described in Signal Regulation.
In a preferred embodiment, the voltage regulator circuit includes, the first diode, the first operational amplifier,
First resistor, second resistance and the first electric capacity and the second electric capacity；
The negative electrode of first diode is connected with the output end of first operational amplifier, anode and the described first fortune
The inverting input and the voltage detecting feedback circuit for calculating amplifier are connected；
The first resistor first end is connected with the first end of second electric capacity, the second end respectively with the second resistance
First end, the in-phase input end of the first end of first electric capacity and first operational amplifier be connected, described second
Second end of resistance is connected with the second end of first electric capacity and connects public terminal GND；
Second termination public terminal GND of second electric capacity.
In a preferred embodiment,
The voltage sampling circuit includes：The secondary assists winding of main transformer, the second diode, the 3rd diode,
Four diodes, the 5th diode；
The Same Name of Ends of the secondary assists winding anode with second diode and the 4th diode respectively
Negative electrode be connected, different name end is connected with the anode of the 3rd diode and the negative electrode of the 5th diode respectively；
The first end of second electric capacity respectively the negative electrode with second diode, the 3rd diode negative electrode with
And the voltage regulator circuit is connected, the second end respectively with the anode of the 4th diode and the sun of the 5th diode
Extremely it is connected and connects public terminal GND.
In a preferred embodiment,
The voltage sampling circuit includes, transformer secondary main winding, the 6th diode；
The anode of 6th diode is connected with the centre cap of the transformer secondary main winding, negative electrode and described the
The first end of two electric capacity is connected；
The end of second electric capacity second is connected with public terminal GND.
In a preferred embodiment,
The voltage sampling circuit includes, primary side sample circuit, sampled signal transfer circuit, and secondary side sampled signal is put
Big circuit；
Wherein, the primary side sample circuit includes, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th
Resistance, the 8th resistance, the second operational amplifier, the 3rd electric capacity, the 4th electric capacity, primary side accessory power supply；
The first end sampled input voltage signal of the 3rd resistor, the second end first end with the 4th resistance respectively
And the first end of the 6th resistance is connected；
3rd electric capacity and the 4th resistor coupled in parallel；
Second end of the 4th resistance is connected with the second end of the 5th resistance and connects public terminal GND；
The first end of 5th resistance respectively with the in-phase input end of second operational amplifier and the described 8th
Second end of resistance is connected；
Second end of the 6th resistance is connected with the inverting input of second operational amplifier；
The first end of 4th electric capacity is connected with the inverting input of second operational amplifier, the second end and institute
The output end for stating the second operational amplifier is connected；
Second end of the 8th resistance samples the voltage signal of the primary side accessory power supply；
The first end of 7th resistance is connected with the output end of second operational amplifier；
Wherein, the sampled signal transfer circuit includes, linear optical coupling；
First pin of the linear optical coupling is connected with the second end of the 7th resistance, and crus secunda and the primary side are auxiliary
Power supply is helped to connect, the 3rd pin is connected with the inverting input of second operational amplifier；4th pin and the 8th resistance
The second end be connected；
Wherein, the secondary side sampled signal amplifying circuit includes, the 9th resistance, the tenth resistance, the 11st resistance, the tenth
Two resistance, secondary side accessory power supply, the 3rd operational amplifier, the 5th electric capacity；
The voltage signal of the first end sampling secondary side accessory power supply of 9th resistance, the second end is respectively with the described tenth
5th pin of the first end of resistance, the in-phase input end of the 3rd operational amplifier and the linear optical coupling is connected；
Second end of the tenth resistance is connected with the second end of second electric capacity and connects public terminal GND；
The first end of 11st resistance is connected with the inverting input of the 3rd operational amplifier, the second end with
The output end of 3rd operational amplifier is connected；
5th electric capacity and the 11st resistor coupled in parallel；
The first end of 12nd resistance is connected with the output end of the 3rd operational amplifier, the second end with it is described
The first end of the first end of second electric capacity and the first resistor is connected.
Another aspect of the present invention also provides a kind of power supply, including, output voltage regulation circuit,
The voltage regulator circuit includes, loop of power circuit circuit, in addition to, feedback control loop, the feedback control loop includes：
Voltage sampling circuit, the input of the voltage sampling circuit are connected with the input of the loop of power circuit circuit,
For gathering the voltage signal of input；
Voltage regulator circuit, the input of the voltage regulator circuit are connected with the output end of the voltage sampling circuit,
For receiving the size of the voltage signal of the input, the voltage signal of the input and default reference voltage signal,
And the reference voltage signal of the feedback control loop is exported according to comparative result；
Voltage detecting feedback circuit, the input of the voltage detecting feedback circuit and the output of the voltage regulator circuit
End and the output end of the loop of power circuit circuit are connected, for receiving the reference voltage signal of the feedback control loop and described
The output voltage signal of loop of power circuit circuit, and believed according to the reference voltage signal of the feedback control loop and the output voltage
Number generation target output voltage signal；
Control circuit, the output end of the control circuit respectively with the output end of the voltage detecting feedback circuit and described
The input of loop of power circuit circuit is connected, for receiving the target output voltage signal, and according to the target output voltage
The output voltage of loop of power circuit circuit described in Signal Regulation.
In a preferred embodiment, the regulation circuit of the power supply includes, the first diode, the first operation amplifier
Device, first resistor, second resistance and the first electric capacity and the second electric capacity；
The negative electrode of first diode is connected with the output end of first operational amplifier, anode and the described first fortune
The inverting input and the voltage detecting feedback circuit for calculating amplifier are connected；
The first resistor first end is connected with the first end of second electric capacity, the second end respectively with the second resistance
First end, the in-phase input end of the first end of first electric capacity and first operational amplifier be connected, described second
Second end of resistance is connected with the second end of first electric capacity and connects public terminal GND；
Second termination public terminal GND of second electric capacity.
In a preferred embodiment,
The voltage sampling circuit of the power supply includes：The secondary assists winding of main transformer, the second diode, the three or two pole
Pipe, the 4th diode, the 5th diode；
The Same Name of Ends of the secondary assists winding anode with second diode and the 4th diode respectively
Negative electrode be connected, different name end is connected with the anode of the 3rd diode and the negative electrode of the 5th diode respectively；
The first end of second electric capacity respectively the negative electrode with second diode, the 3rd diode negative electrode with
And the voltage regulator circuit is connected, the second end respectively with the anode of the 4th diode and the sun of the 5th diode
Extremely it is connected and connects public terminal GND.
In a preferred embodiment,
The voltage sampling circuit of the power supply includes, transformer secondary main winding, the 6th diode；
The anode of 6th diode is connected with the centre cap of the transformer secondary main winding, negative electrode and described the
The first end of two electric capacity is connected；
The end of second electric capacity second is connected with public terminal GND.
In a preferred embodiment,
The voltage sampling circuit of the power supply includes, primary side sample circuit, sampled signal transfer circuit, secondary side sampling
Signal amplification circuit；
Wherein, the primary side sample circuit includes, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th
Resistance, the 8th resistance, the second operational amplifier, the 3rd electric capacity, the 4th electric capacity, primary side accessory power supply；
The first end sampled input voltage signal of the 3rd resistor, the second end first end with the 4th resistance respectively
And the first end of the 6th resistance is connected；
3rd electric capacity and the 4th resistor coupled in parallel；
Second end of the 4th resistance is connected with the second end of the 5th resistance and connects public terminal GND；
The first end of 5th resistance respectively with the in-phase input end of second operational amplifier and the described 8th
Second end of resistance is connected；
Second end of the 6th resistance is connected with the inverting input of second operational amplifier；
The first end of 4th electric capacity is connected with the inverting input of second operational amplifier, the second end and institute
The output end for stating the second operational amplifier is connected；
Second end of the 8th resistance samples the voltage signal of the primary side accessory power supply；
The first end of 7th resistance is connected with the output end of second operational amplifier；
Wherein, the sampled signal transfer circuit includes, linear optical coupling；
First pin of the linear optical coupling is connected with the second end of the 7th resistance, and crus secunda and the primary side are auxiliary
Power supply is helped to connect, the 3rd pin is connected with the inverting input of second operational amplifier；4th pin and the 8th resistance
The second end be connected；
Wherein, the secondary side sampled signal amplifying circuit includes, the 9th resistance, the tenth resistance, the 11st resistance, the tenth
Two resistance, secondary side accessory power supply, the 3rd operational amplifier, the 5th electric capacity；
The voltage signal of the first end sampling secondary side accessory power supply of 9th resistance, the second end is respectively with the described tenth
5th pin of the first end of resistance, the in-phase input end of the 3rd operational amplifier and the linear optical coupling is connected；
Second end of the tenth resistance is connected with the second end of second electric capacity and connects public terminal GND；
The first end of 11st resistance is connected with the inverting input of the 3rd operational amplifier, the second end with
The output end of 3rd operational amplifier is connected；
5th electric capacity and the 11st resistor coupled in parallel；
The first end of 12nd resistance is connected with the output end of the 3rd operational amplifier, the second end with it is described
The first end of the first end of second electric capacity and the first resistor is connected.
As shown from the above technical solution, adjusted the invention discloses a kind of output voltage regulation circuit and using output voltage
The power supply on economize on electricity road, including, loop of power circuit circuit, in addition to, feedback control loop, feedback control loop includes voltage sampling circuit, voltage
Circuit, voltage detecting feedback circuit and control circuit are adjusted, wherein, the voltage signal of voltage sampling circuit collection input, voltage
Circuit is adjusted according to the voltage signal of input compared with default reference voltage, the reference voltage for exporting feedback control loop is believed
Number, voltage detecting feedback circuit generates target output voltage according to the reference voltage signal and output voltage information of feedback control loop to be believed
Number, the output voltage of loop of power circuit circuit is adjusted according to target output voltage signal for control circuit.So, output voltage
After voltage regulator circuit and the regulation of voltage detecting feedback circuit, can linearly it be adjusted according to the change of input voltage
Section, keep output voltage precision high while realizing and improve power-efficient, meanwhile, power module in full input voltage all the time
Closed loop operation is kept, in the absence of open loop and the switching state of closed loop, so stability is also very high, and then protects late-class circuit.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of structural representation for output voltage regulation circuit that the embodiment of the present application one provides；
Fig. 2 is a kind of structural representation for output voltage regulation circuit that the embodiment of the present application two provides；
Fig. 3 is the structural representation for another output voltage regulation circuit that the embodiment of the present application two provides；
Fig. 4 is the structural representation for another output voltage regulation circuit that the embodiment of the present application two provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment one
Fig. 1 is a kind of structural representation for output voltage regulation circuit that the embodiment of the present application one provides, and the application is implemented
Output voltage regulation circuit in example may apply in switch converters, and switch converters are the core of modern transformation of electrical energy technology
Heart part, and the basic composition of the system such as all kinds of power supplys, frequency converter, UPS, photovoltaic generation, wind power generation, LED illumination
Unit, be widely used in electric power, communication, household electrical appliances, railway traffic, automotive electronics, Industry Control, instrument and meter, Aeronautics and Astronautics,
The fields such as navigation.
Voltage stabilization is kept while power-efficient is improved in order to realize, in the present embodiment, output voltage regulation electricity
Road includes, loop of power circuit circuit 101, and loop of power circuit circuit is the conventional modular circuit of power module in the prior art, herein not
Repeat again.
Output voltage regulation circuit also includes, and feedback control loop 100, feedback control loop 100 includes：Voltage sampling circuit 102, electricity
Voltage regulator circuit 104, voltage detecting feedback circuit 105 and control circuit 103.
Wherein, the input of voltage sampling circuit 102 is connected with the input of the loop of power circuit circuit 101, for adopting
Collect the voltage signal of input.The voltage signal of the collection input of input voltage sample circuit 102 can include：Use main transformer
Rectifying and wave-filtering is carried out after assists winding sampling to obtain, the current rectifying and wave filtering circuit is according to the different using relative of main power topological circuit
The current rectifying and wave filtering circuit answered；Or obtained after the signal progress rectifying and wave-filtering on the sampling main power winding of transformer；Or directly
Sampled input voltage.As can be seen that voltage sampling circuit 102 be by directly or indirectly sampling the voltage signal of input after,
The voltage signal for sampling input is output to voltage regulator circuit.
Voltage regulator circuit 104, the input of voltage regulator circuit 104 are connected with the output end of voltage sampling circuit 102,
For receiving the voltage signal of input, compare the voltage signal of input and the size of default reference voltage signal, and according to than
Relatively result exports the reference voltage signal of the feedback control loop.
In the embodiment of the present application, the voltage regulator circuit 104 of voltage regulator circuit 104 is by the voltage signal of the input of sampling
With being judged after default reference voltage signal, judgment mode can include following manner：
When the voltage signal of the input of sampling is less than default reference voltage signal, amplifier is defeated in voltage regulator circuit
Go out level reduction, while as the voltage signal of input reduces and linearly turns down preconditioning voltage signal.When the voltage of input is believed
Number from less than default reference voltage signal, to when being raised more than or equal to reference voltage signal, same also can be with input electricity
Press the rise of signal and linear heighten preconditioning voltage signal.
The reference voltage signal of feedback control loop is turned down, it is therefore an objective to adjust output voltage and follow input voltage to change, make electricity
Source also carries out Closed loop operation when input voltage signal is less than default reference voltage.Can solve power supply from opened loop control to switch
The problems such as to the output voltage overshoot easily occurred during closed-loop control or dropping, ensure the phase of output voltage during input voltage mutation
To stabilization, power protection is not triggered, further protection power source is not damaged by with the device of late-class circuit in itself.
When the voltage signal of the input of sampling is more than or equal to default reference voltage signal, voltage regulator circuit 104
The level of middle output is equal to or higher than default reference voltage signal, due to output voltage regulation circuit 104 output end with it is pre-
If reference voltage signal end be connected by a backward dioded, therefore output voltage regulation circuit output end output it is presetting
Section voltage signal or default reference voltage signal, feedback control loop are fed back according to loop reference voltage signal, output electricity
Press burning voltage output.
Voltage detecting feedback circuit 105, the input of voltage detecting feedback circuit 105 are defeated with voltage regulator circuit 104
The output end for going out end and loop of power circuit circuit 101 is connected, and the reference voltage signal and power for receiving feedback control loop return
The output voltage signal of road circuit 101, and target is generated according to the reference voltage signal and output voltage signal of feedback control loop
Output voltage signal.
Voltage detecting feedback circuit 105 is the inverting input by being input to amplifier after resistance detection output voltage, is led to
Negative-feedback regu- lation COMP terminal voltages are crossed, and then the output voltage of loop of power circuit circuit 101 is adjusted by control circuit 103.Voltage
Can be included by detecting feedback circuit by two kinds：1st, the circuit fed back using amplifier；2nd, fed back using shunt regulator (TLV431)
Circuit.
As can be seen that when the voltage signal of input is less than default reference voltage signal, voltage detecting feedback circuit 105
In feedback control loop reference voltage signal be follow voltage regulator circuit 104 linear change and linear change.
Control circuit 103, the output end of control circuit 103 is connected with the input of loop of power circuit circuit 101, for receiving
Target regulated voltage signal, and according to the output voltage of target regulated voltage Signal Regulation control loop of power circuit circuit 101.
It can be seen from the above technical proposal that the output voltage regulation circuit disclosed in the embodiment of the present application can be according to defeated
Enter the change of voltage and output voltage is adjusted, also, because the output voltage regulation circuit in the embodiment of the present application is
The components accuracy of each circuit is all very high on middle feedback control loop, therefore, can while power supply delivery efficiency is ensured, output
Precision is very high, meanwhile, power module all remains Closed loop operation in full input voltage, in the absence of open loop and the switching of closed loop
State, so stability is also very high.
On the other hand, the output voltage regulation circuit in the embodiment of the present application is due to being not using input voltage sampling electricity
Resistance, electric capacity and control chip generate feedforward triangular wave jointly, and entering line output voltage by the triangular wave that feedovers is adjusted, due to electric capacity
It is larger with the error of control chip, so the deviation of triangular wave is also larger, and then cause the precision of output voltage poor.The application
Resistance sampling input voltage is used in embodiment, and sampled value is controlled to the feedback control loop of power supply more afterwards, its precision is higher.Cause
This, the output voltage regulation circuit in the embodiment of the present application can more accurately adjust output voltage.
Embodiment two
Fig. 2 is a kind of structural representation for output voltage regulation circuit that the embodiment of the present application one provides, in the present embodiment
In, voltage regulator circuit 104 includes, the first diode VD1, the first operational amplifier D1, first resistor R1, second resistance R2,
And the first electric capacity C1 and the second electric capacity C2；
First diode VD1 negative electrode is connected with the first operational amplifier D1 output end, anode and the first operation amplifier
Device D1 inverting input and voltage detecting feedback circuit 105 is connected；
First resistor R1 first ends are connected with the second electric capacity C2 first end, the second end respectively with second resistance R2 first
The in-phase input end at end, the first electric capacity C1 first end and the first operational amplifier D1 is connected, second resistance R2 the second end
It is connected with the first electric capacity C1 the second end and connects public terminal GND；
Second electric capacity C2 the second termination public terminal GND.
Preferably, as shown in Fig. 2
Voltage sampling circuit 102 includes：Main transformer T1 secondary assists winding, the second diode VD2, the 3rd diode
VD3, the 4th diode VD4, the 5th diode VD5 and the second electric capacity C2；
The Same Name of Ends of secondary assists winding respectively with the second diode VD2 anode and the 4th diode VD4 negative electrode
It is connected, different name end is connected with the 3rd diode VD3 anode and the 5th diode VD5 negative electrode respectively；
Second electric capacity C2 the first end negative electrode with the second diode VD2, the 3rd diode VD3 respectively negative electrode and electricity
Voltage regulator circuit 104 is connected, and the second end is connected with the 4th diode VD4 anode and the 5th diode VD5 anode respectively
And connect public terminal GND.
In the present embodiment, because the pulsewidth and amplitude of secondary side assists winding are corresponding with primary side input voltage, therefore,
The DC level that pulsewidth waveform by sampling Circuit Fault on Secondary Transformer obtained after rectifying and wave-filtering is directly proportional to input voltage.When
Input voltage reduce when, due to primary side supervisor drive pulsewidth have arrived at maximum, so the pulse width of transformer with
The reduction of input voltage keeps constant, but the impulse amplitude of transformer reduces with the reduction of input voltage, so will become
The level that voltage waveform in depressor secondary side assists winding obtained after rectifying and wave-filtering is also just with the reduction of input voltage
And linear reduction.Input voltage sampled signal obtained from entering also follows the reduction of input voltage and linear reduction, then basis
A kind of regulative mode of embodiment enters the regulation of line output voltage.Power supply is avoided to work in full voltage range inner feedback loop
Open loop situations.
Preferably, as shown in figure 3,
Voltage sampling circuit 102 includes, transformer T1 secondary main winding, the 6th diode VD6；
6th diode VD6 anode is connected with the centre cap of the transformer secondary main winding, negative electrode and the second electricity
The first end for holding C2 is connected.
Using above-mentioned sample circuit, the device of sample circuit is few, and it need not increase new Transformer Winding and carry out
Sampling, saves the volume of power supply, while the coupling avoided between winding and winding caused by extra Transformer Winding is made
Into cross regulation rate it is larger the problem of.
Preferably, as shown in figure 4,
Voltage sampling circuit 102 includes, primary side sample circuit 401, sampled signal transfer circuit 402, secondary side sampling
Signal amplification circuit 403；
Wherein, primary side sample circuit 401 includes, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8, the second operational amplifier D2, the 3rd electric capacity C3, the 4th electric capacity C4, primary side auxiliary electricity
Source VCC1；
3rd resistor R3 first end sampled input voltage signal, the second end respectively with the 4th resistance R4 first end and
The first end of the 6th resistance R6 is connected；
3rd electric capacity C3 is in parallel with the 4th resistance R4；
4th resistance R4 the second end is connected with the 5th resistance R5 the second end and connects public terminal GND；
5th resistance R5 first end respectively with the second operational amplifier D2 in-phase input end and the 8th resistance R8
Second end is connected；
6th resistance R6 the second end is connected with the second operational amplifier D2 inverting input；
4th electric capacity C4 first end is connected with the second operational amplifier D2 inverting input, the second end and the second fortune
The output end for calculating amplifier D2 is connected；
8th resistance R8 the second end sampling primary side accessory power supply VCC1 voltage signal；
7th resistance R7 first end is connected with the second operational amplifier D2 output end；
Wherein, the sampled signal transfer circuit 402 includes, linear optical coupling D3；
Linear optical coupling D3 the first pin is connected with the 7th resistance R7 the second end, crus secunda and primary side accessory power supply
VCC1 connections, the 3rd pin are connected with the second operational amplifier D2 inverting input；The second of 4th pin and the 8th resistance R8
End is connected；
Wherein, secondary side sampled signal amplifying circuit 403 includes, the 9th resistance R9, the tenth resistance R10, the 11st resistance
R11, the 12nd resistance R12, secondary side accessory power supply VCC2, the 3rd operational amplifier D4, the 5th electric capacity C5；
9th resistance R9 first end sampling secondary side accessory power supply VCC2 voltage signal, the second end are electric with the tenth respectively
Resistance R10 first end, the 3rd operational amplifier D4 in-phase input end and linear optical coupling D3 the 5th pin is connected；
Tenth resistance R10 the second end is connected with the second electric capacity C2 the second end and connects public terminal GND；
11st resistance R11 first end is connected with the inverting input of the 3rd operational amplifier D4, the second end
It is connected with the 3rd operational amplifier D4 output end；
5th electric capacity C5 is in parallel with the 11st resistance R 11；
12nd resistance R12 first end is connected with the 3rd operational amplifier D4 output end, the second end and the second electricity
Hold C 2 first end and first resistor R1 first end is connected.
For the program by the way that sampled signal is delivered into secondary side after direct sampled input voltage, secondary side is defeated by what is received
Enter and output voltage regulation circuit is output to after voltage signal is amplified, then output voltage regulation circuit is believed according to input voltage
Number regulation output voltage.When input voltage reduces, electric current that amplifier D3 is fed back sampling with linear optical coupling by electric capacity C4
Signal is integrated, then amplifier D3 output end exports the magnitude of voltage proportional to input voltage integration, and the magnitude of voltage is input to
Linear optical coupling so that the current signal of linear optical coupling reduces as input voltage reduces；The secondary side of linear optical coupling detects
The current signal of primary side transmission, the current signal is input to the electricity that will receive of signal amplification amplifier D4, D4 of secondary side
A galvanic current is exported after a certain proportion of amplification of stream signal progress to put down, with the reduction of input voltage, linear optical coupling one
The transmission current reduction of secondary side, the current signal that its secondary side joint receives reduce, then amplifier D4 output voltage reduces, so two
Secondary side D4 output voltage and the input voltage of primary side are in direct ratio.After sampling input voltage signal, according to embodiment one
The regulative mode that kind is recorded is adjusted.
On the other hand the application discloses the output voltage regulation circuit in a kind of power supply, including above-mentioned any embodiment.
Obviously, it can reach using the power supply of the output voltage regulation circuit in above-mentioned any embodiment and adjust electricity with foregoing output voltage
Road identical technique effect, will not be repeated here.
Finally, it is to be noted that, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also the other element including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except other identical element in the process including the key element, method, article or equipment being also present.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the application.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from spirit herein or scope.Therefore, the application
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (2)
1. a kind of output voltage regulation circuit, including, loop of power circuit circuit, it is characterised in that also include, feedback control loop is described
Feedback control loop includes：
Voltage sampling circuit, the input of the voltage sampling circuit are connected with the input of the loop of power circuit circuit, are used for
Gather the voltage signal of input；
Voltage regulator circuit, the input of the voltage regulator circuit are connected with the output end of the voltage sampling circuit, are used for
Receive the voltage signal of the input, the size of the voltage signal of the input and default reference voltage signal, and root
The reference voltage signal of the feedback control loop is exported according to comparative result；
Voltage detecting feedback circuit, the input of the voltage detecting feedback circuit and the output end of the voltage regulator circuit with
And the output end of the loop of power circuit circuit is connected, for the reference voltage signal for receiving the feedback control loop and the power
The output voltage signal of loop circuit, and given birth to according to the reference voltage signal of the feedback control loop and the output voltage signal
Into target output voltage signal；
Control circuit, the output end of the control circuit output end with the voltage detecting feedback circuit and the power respectively
The input of loop circuit is connected, for receiving the target output voltage signal, and according to the target output voltage signal
Adjust the output voltage of the loop of power circuit circuit；
The voltage regulator circuit includes, the first diode, the first operational amplifier, first resistor, second resistance and the first electricity
Hold and the second electric capacity；
The negative electrode of first diode is connected with the output end of first operational amplifier, and anode is put with first computing
The inverting input and the voltage detecting feedback circuit of big device are connected；
The first resistor first end is connected with the first end of second electric capacity, the second end respectively with the second resistance
The in-phase input end of one end, the first end of first electric capacity and first operational amplifier is connected, the second resistance
The second end be connected with the second end of first electric capacity and connect public terminal GND；
Second termination public terminal GND of second electric capacity；
The voltage sampling circuit includes, primary side sample circuit, sampled signal transfer circuit, secondary side sampled signal amplification electricity
Road；
Wherein, the primary side sample circuit includes, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
8th resistance, the second operational amplifier, the 3rd electric capacity, the 4th electric capacity, primary side accessory power supply；
The first end sampled input voltage signal of the 3rd resistor, the second end respectively with the first end of the 4th resistance and
The first end of 6th resistance is connected；
3rd electric capacity and the 4th resistor coupled in parallel；
Second end of the 4th resistance is connected with the second end of the 5th resistance and connects public terminal GND；
The first end of 5th resistance in-phase input end with second operational amplifier and the 8th resistance respectively
The second end be connected；
Second end of the 6th resistance is connected with the inverting input of second operational amplifier；
The first end of 4th electric capacity is connected with the inverting input of second operational amplifier, the second end and described the
The output end of two operational amplifiers is connected；
Second end of the 8th resistance samples the voltage signal of the primary side accessory power supply；
The first end of 7th resistance is connected with the output end of second operational amplifier；
Wherein, the sampled signal transfer circuit includes, linear optical coupling；
First pin of the linear optical coupling is connected with the second end of the 7th resistance, crus secunda and primary side auxiliary electricity
Source connects, and the 3rd pin is connected with the inverting input of second operational amplifier；The of 4th pin and the 8th resistance
Two ends are connected；
Wherein, the secondary side sampled signal amplifying circuit includes, the 9th resistance, the tenth resistance, the 11st resistance, the 12nd electricity
Resistance, secondary side accessory power supply, the 3rd operational amplifier, the 5th electric capacity；
9th resistance first end sampling secondary side accessory power supply voltage signal, the second end respectively with the tenth resistance
First end, the in-phase input end of the 3rd operational amplifier and the 5th pin of the linear optical coupling be connected；
Second end of the tenth resistance is connected with the second end of second electric capacity and connects public terminal GND；
The first end of 11st resistance is connected with the inverting input of the 3rd operational amplifier, the second end with it is described
The output end of 3rd operational amplifier is connected；
5th electric capacity and the 11st resistor coupled in parallel；
The first end of 12nd resistance is connected with the output end of the 3rd operational amplifier, the second end and described second
The first end of the first end of electric capacity and the first resistor is connected.
2. a kind of power supply, it is characterised in that including output voltage regulation circuit；
The output voltage regulation circuit includes, loop of power circuit circuit, in addition to, feedback control loop, the feedback control loop includes：
Voltage sampling circuit, the input of the voltage sampling circuit are connected with the input of the loop of power circuit circuit, are used for
Gather the voltage signal of input；
Voltage regulator circuit, the input of the voltage regulator circuit are connected with the output end of the voltage sampling circuit, are used for
Receive the voltage signal of the input, the size of the voltage signal of the input and default reference voltage signal, and root
The reference voltage signal of the feedback control loop is exported according to comparative result；
Voltage detecting feedback circuit, the input of the voltage detecting feedback circuit and the output end of the voltage regulator circuit with
And the output end of the loop of power circuit circuit is connected, for the reference voltage signal for receiving the feedback control loop and the power
The output voltage signal of loop circuit, and given birth to according to the reference voltage signal of the feedback control loop and the output voltage signal
Into target output voltage signal；
Control circuit, the output end of the control circuit output end with the voltage detecting feedback circuit and the power respectively
The input of loop circuit is connected, for receiving the target output voltage signal, and according to the target output voltage signal
Adjust the output voltage of the loop of power circuit circuit；
The voltage regulator circuit includes, the first diode, the first operational amplifier, first resistor, second resistance and the first electricity
Hold and the second electric capacity；
The negative electrode of first diode is connected with the output end of first operational amplifier, and anode is put with first computing
The inverting input and the voltage detecting feedback circuit of big device are connected；
The first resistor first end is connected with the first end of second electric capacity, the second end respectively with the second resistance
The in-phase input end of one end, the first end of first electric capacity and first operational amplifier is connected, the second resistance
The second end be connected with the second end of first electric capacity and connect public terminal GND；
Second termination public terminal GND of second electric capacity；
The voltage sampling circuit includes, primary side sample circuit, sampled signal transfer circuit, secondary side sampled signal amplification electricity
Road；
Wherein, the primary side sample circuit includes, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
8th resistance, the second operational amplifier, the 3rd electric capacity, the 4th electric capacity, primary side accessory power supply；
The first end sampled input voltage signal of the 3rd resistor, the second end respectively with the first end of the 4th resistance and
The first end of 6th resistance is connected；
3rd electric capacity and the 4th resistor coupled in parallel；
Second end of the 4th resistance is connected with the second end of the 5th resistance and connects public terminal GND；
The first end of 5th resistance in-phase input end with second operational amplifier and the 8th resistance respectively
The second end be connected；
Second end of the 6th resistance is connected with the inverting input of second operational amplifier；
The first end of 4th electric capacity is connected with the inverting input of second operational amplifier, the second end and described the
The output end of two operational amplifiers is connected；
Second end of the 8th resistance samples the voltage signal of the primary side accessory power supply；
The first end of 7th resistance is connected with the output end of second operational amplifier；
Wherein, the sampled signal transfer circuit includes, linear optical coupling；
First pin of the linear optical coupling is connected with the second end of the 7th resistance, crus secunda and primary side auxiliary electricity
Source connects, and the 3rd pin is connected with the inverting input of second operational amplifier；The of 4th pin and the 8th resistance
Two ends are connected；
Wherein, the secondary side sampled signal amplifying circuit includes, the 9th resistance, the tenth resistance, the 11st resistance, the 12nd electricity
Resistance, secondary side accessory power supply, the 3rd operational amplifier, the 5th electric capacity；
9th resistance first end sampling secondary side accessory power supply voltage signal, the second end respectively with the tenth resistance
First end, the in-phase input end of the 3rd operational amplifier and the 5th pin of the linear optical coupling be connected；
Second end of the tenth resistance is connected with the second end of second electric capacity and connects public terminal GND；
The first end of 11st resistance is connected with the inverting input of the 3rd operational amplifier, the second end with it is described
The output end of 3rd operational amplifier is connected；
5th electric capacity and the 11st resistor coupled in parallel；
The first end of 12nd resistance is connected with the output end of the 3rd operational amplifier, the second end and described second
The first end of the first end of electric capacity and the first resistor is connected.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108111172A (en) * | 2017-12-25 | 2018-06-01 | 广州市熙泰自控设备有限公司 | A kind of circuit that digital quantity is converted to resistance output |
| CN109976436B (en) * | 2017-12-27 | 2021-03-23 | 瑞昱半导体股份有限公司 | Voltage detector and communication circuit |
| CN108768349A (en) * | 2018-06-05 | 2018-11-06 | 北京目黑科技有限公司 | A kind of signal conditioner |
| TWI671983B (en) * | 2018-08-08 | 2019-09-11 | 華邦電子股份有限公司 | Voltage regulator and dynamic bleeder current circuit |
| CN109406860A (en) * | 2018-12-24 | 2019-03-01 | 厦门能瑞康电子有限公司 | A kind of voltage sampling circuit |
| CN111736648B (en) * | 2020-05-26 | 2022-08-09 | 科华恒盛股份有限公司 | Output voltage control method and device and terminal equipment |
Citations (3)
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|---|---|---|---|---|
| CN101162869A (en) * | 2007-10-26 | 2008-04-16 | 东南大学 | Sample-taking feedback circuit of switch electric power output electric voltage |
| CN101656465A (en) * | 2008-08-22 | 2010-02-24 | 通嘉科技股份有限公司 | Control circuit, power converter and control method |
| CN101989814A (en) * | 2009-07-29 | 2011-03-23 | 台达电子工业股份有限公司 | Voltage-regulating circuit and parallel voltage-regulating circuit system using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8179699B2 (en) * | 2008-12-31 | 2012-05-15 | Stmicroelectronics S.R.L. | Method for controlling a switching regulator and related switching regulator |
| DE102011081719A1 (en) * | 2011-08-29 | 2013-02-28 | Siemens Aktiengesellschaft | Arrangement with a potential-separated power supply device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162869A (en) * | 2007-10-26 | 2008-04-16 | 东南大学 | Sample-taking feedback circuit of switch electric power output electric voltage |
| CN101656465A (en) * | 2008-08-22 | 2010-02-24 | 通嘉科技股份有限公司 | Control circuit, power converter and control method |
| CN101989814A (en) * | 2009-07-29 | 2011-03-23 | 台达电子工业股份有限公司 | Voltage-regulating circuit and parallel voltage-regulating circuit system using the same |
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