CN105048815A - Output voltage regulating circuit and power supply - Google Patents
Output voltage regulating circuit and power supply Download PDFInfo
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- CN105048815A CN105048815A CN201510224744.6A CN201510224744A CN105048815A CN 105048815 A CN105048815 A CN 105048815A CN 201510224744 A CN201510224744 A CN 201510224744A CN 105048815 A CN105048815 A CN 105048815A
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Abstract
Embodiments of the invention provide an output voltage regulating circuit, and a power supply. The output voltage regulating circuit comprises a power loop circuit, a voltage sampling circuit used for acquiring an input voltage signal, a voltage regulating circuit used for receiving the input voltage signal and comparing the input voltage signal with a preset reference voltage signal to obtain a pre-regulating voltage signal, a voltage detection feedback circuit used for receiving the pre-regulating voltage signal and the output voltage signal of the power loop circuit and comparing the pre-regulating voltage signal with the output voltage signal to obtain a target regulating voltage signal, a control circuit used for receiving the target regulating voltage signal and controlling the output voltage of the power loop circuit according to the target regulating voltage signal. In this way, the output voltage is ensured to be stable. The power supply provided by the invention is provided with the above output voltage regulating circuit. Therefore, the efficiency of the power supply is improved, while the output voltage is ensured to be stable at the same time.
Description
Technical field
The application relates to circuit field, relates to a kind of output voltage regulation circuit and power supply in particular
Background technology
Along with the development of the communication technology, communication power supply often needs to work under severe operational environment, therefore, more and more higher to the power requirement of communication power supply busbar modules, in order to reach output voltage energy practical requirement, in prior art, the efficiency of communication power supply busbar modules can be improved by transformer turns ratio reasonable in design.
But, after designing according to transformer turns ratio, although communication power supply busbar modules efficiency can be made to reach optimum, but due to transformer turns ratio is designed to optimum, result in the duty ratio of power source bus module under the condition of nominal input voltage and reached maximum, thus along with the reduction of input voltage, the duty ratio of power source bus module keeps maximum constant, output voltage then can reduce along with the reduction of input voltage, cause power module and be operated in open loop situations, and output voltage can not within the accuracy rating that voltage stabilizing is certain, the output voltage that even there will be the communication power supply busbar modules when input voltage mutation exceeds the input voltage range of rear level power supply, and then there is the phenomenon damaging late-class circuit.At present, there is not the technical scheme solving output voltage instability under the condition improving busbar modules whole efficiency in power supply producer.
Therefore, how realize improving output voltage precision under the condition improving busbar modules whole efficiency and stability needs the technical problem of solution badly.
Summary of the invention
In order to solve the problems of the technologies described above, the embodiment of the present application provides a kind of output voltage regulation circuit, to realize keeping output voltage stabilization while raising power-efficient.
For achieving the above object, the embodiment of the present invention provides a kind of output voltage regulation circuit, comprises, loop of power circuit circuit, feedback control loop, and described feedback control loop comprises:
Voltage sampling circuit, the input of described voltage sampling circuit is connected with the input of described loop of power circuit circuit, for the voltage signal of Gather and input;
Voltage regulator circuit, the input of described voltage regulator circuit is connected with the output of described voltage sampling circuit, for receiving the voltage signal of described input, the voltage signal of more described input and the size of the reference voltage signal preset, and the reference voltage signal of described feedback control loop is exported according to comparative result;
Voltage detecting feedback circuit, the input of described voltage detecting feedback circuit is connected with the output of the output of described voltage regulator circuit and described loop of power circuit circuit, for the output voltage signal of the reference voltage signal and described loop of power circuit circuit that receive described feedback control loop, and generate target output voltage signal according to the reference voltage signal of described feedback control loop and described output voltage signal;
Control circuit, the output of described control circuit is connected with the input of described loop of power circuit circuit with the output of described voltage detecting feedback circuit respectively, for receiving described target output voltage signal, and according to described target output voltage Signal Regulation the output voltage of loop of power circuit circuit.
In a preferred embodiment, described voltage regulator circuit comprises, the first diode, the first operational amplifier, the first resistance, the second resistance and the first electric capacity and the second electric capacity;
The negative electrode of described first diode is connected with the output of described first operational amplifier, and inverting input and the described voltage detecting feedback circuit of anode and described first operational amplifier are connected;
Described first resistance first end is connected with the first end of described second electric capacity, second end is connected with the in-phase input end of the first end of described second resistance, the first end of described first electric capacity and described first operational amplifier respectively, and the second end of described second resistance is connected with the second end of described first electric capacity and connects public terminal GND;
Second termination public terminal GND of described second electric capacity.
In a preferred embodiment,
Described voltage sampling circuit comprises: the secondary of main transformer assists winding, the second diode, the 3rd diode, the 4th diode, the 5th diode;
Described secondary assists the Same Name of Ends of winding to be connected with the anode of described second diode and the negative electrode of described 4th diode respectively, and different name end is connected with the anode of described 3rd diode and the negative electrode of described 5th diode respectively;
The first end of described second electric capacity is connected with the negative electrode of described second diode, the negative electrode of described 3rd diode and described voltage regulator circuit respectively, and the second end is connected with the anode of described 4th diode and the anode of described 5th diode and connects public terminal GND respectively.
In a preferred embodiment,
Described voltage sampling circuit comprises, transformer secondary main winding, the 6th diode;
The anode of described 6th diode is connected with the centre cap of described transformer secondary main winding, and negative electrode is connected with the first end of described second electric capacity;
Described second electric capacity second end is connected with public terminal GND.
In a preferred embodiment,
Described voltage sampling circuit comprises, primary side sample circuit, sampled signal transfer circuit, secondary side sampled signal amplifying circuit;
Wherein, described primary side sample circuit comprises, the 3rd resistance, 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 described 3rd resistance, the second end is connected with the first end of described 4th resistance and the first end of described 6th resistance respectively;
Described 3rd electric capacity and described 4th resistor coupled in parallel;
Second end of described 4th resistance is connected with the second end of described 5th resistance and connects public terminal GND;
The first end of described 5th resistance is connected with the in-phase input end of described second operational amplifier and the second end of described 8th resistance respectively;
Second end of described 6th resistance is connected with the inverting input of described second operational amplifier;
The first end of described 4th electric capacity is connected with the inverting input of described second operational amplifier, and the second end is connected with the output of described second operational amplifier;
Second end of described 8th resistance is sampled the voltage signal of described primary side accessory power supply;
The first end of described 7th resistance is connected with the output of described second operational amplifier;
Wherein, described sampled signal transfer circuit comprises, linear optical coupling;
First pin of described linear optical coupling is connected with the second end of described 7th resistance, and crus secunda is connected with described primary side accessory power supply, and tripod is connected with the inverting input of described second operational amplifier; 4th pin is connected with the second end of described 8th resistance;
Wherein, described secondary side sampled signal amplifying circuit comprises, the 9th resistance, the tenth resistance, the 11 resistance, the 12 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 described 9th resistance, the second end is connected with the first end of described tenth resistance, the in-phase input end of described 3rd operational amplifier and the 5th pin of described linear optical coupling respectively;
Second end of described tenth resistance is connected with the second end of described second electric capacity and connects public terminal GND;
The first end of described 11 resistance is connected with the inverting input of described 3rd operational amplifier, and the second end is connected with the output of described 3rd operational amplifier;
Described 5th electric capacity and described 11 resistor coupled in parallel;
The first end of described 12 resistance is connected with the output of described 3rd operational amplifier, and the second end is connected with the first end of described second electric capacity and the first end of described first resistance.
The present invention also provides a kind of power supply on the other hand, comprises, output voltage regulation circuit,
Described voltage regulator circuit comprises, and loop of power circuit circuit, also comprises, feedback control loop, and described feedback control loop comprises:
Voltage sampling circuit, the input of described voltage sampling circuit is connected with the input of described loop of power circuit circuit, for the voltage signal of Gather and input;
Voltage regulator circuit, the input of described voltage regulator circuit is connected with the output of described voltage sampling circuit, for receiving the voltage signal of described input, the voltage signal of more described input and the size of the reference voltage signal preset, and the reference voltage signal of described feedback control loop is exported according to comparative result;
Voltage detecting feedback circuit, the input of described voltage detecting feedback circuit is connected with the output of the output of described voltage regulator circuit and described loop of power circuit circuit, for the output voltage signal of the reference voltage signal and described loop of power circuit circuit that receive described feedback control loop, and generate target output voltage signal according to the reference voltage signal of described feedback control loop and described output voltage signal;
Control circuit, the output of described control circuit is connected with the input of described loop of power circuit circuit with the output of described voltage detecting feedback circuit respectively, for receiving described target output voltage signal, and according to described target output voltage Signal Regulation the output voltage of loop of power circuit circuit.
In a preferred embodiment, the regulating circuit of described power supply comprises, the first diode, the first operational amplifier, the first resistance, the second resistance and the first electric capacity and the second electric capacity;
The negative electrode of described first diode is connected with the output of described first operational amplifier, and inverting input and the described voltage detecting feedback circuit of anode and described first operational amplifier are connected;
Described first resistance first end is connected with the first end of described second electric capacity, second end is connected with the in-phase input end of the first end of described second resistance, the first end of described first electric capacity and described first operational amplifier respectively, and the second end of described second resistance is connected with the second end of described first electric capacity and connects public terminal GND;
Second termination public terminal GND of described second electric capacity.
In a preferred embodiment,
The voltage sampling circuit of described power supply comprises: the secondary of main transformer assists winding, the second diode, the 3rd diode, the 4th diode, the 5th diode;
Described secondary assists the Same Name of Ends of winding to be connected with the anode of described second diode and the negative electrode of described 4th diode respectively, and different name end is connected with the anode of described 3rd diode and the negative electrode of described 5th diode respectively;
The first end of described second electric capacity is connected with the negative electrode of described second diode, the negative electrode of described 3rd diode and described voltage regulator circuit respectively, and the second end is connected with the anode of described 4th diode and the anode of described 5th diode and connects public terminal GND respectively.
In a preferred embodiment,
The voltage sampling circuit of described power supply comprises, transformer secondary main winding, the 6th diode;
The anode of described 6th diode is connected with the centre cap of described transformer secondary main winding, and negative electrode is connected with the first end of described second electric capacity;
Described second electric capacity second end is connected with public terminal GND.
In a preferred embodiment,
The voltage sampling circuit of described power supply comprises, primary side sample circuit, sampled signal transfer circuit, secondary side sampled signal amplifying circuit;
Wherein, described primary side sample circuit comprises, the 3rd resistance, 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 described 3rd resistance, the second end is connected with the first end of described 4th resistance and the first end of described 6th resistance respectively;
Described 3rd electric capacity and described 4th resistor coupled in parallel;
Second end of described 4th resistance is connected with the second end of described 5th resistance and connects public terminal GND;
The first end of described 5th resistance is connected with the in-phase input end of described second operational amplifier and the second end of described 8th resistance respectively;
Second end of described 6th resistance is connected with the inverting input of described second operational amplifier;
The first end of described 4th electric capacity is connected with the inverting input of described second operational amplifier, and the second end is connected with the output of described second operational amplifier;
Second end of described 8th resistance is sampled the voltage signal of described primary side accessory power supply;
The first end of described 7th resistance is connected with the output of described second operational amplifier;
Wherein, described sampled signal transfer circuit comprises, linear optical coupling;
First pin of described linear optical coupling is connected with the second end of described 7th resistance, and crus secunda is connected with described primary side accessory power supply, and tripod is connected with the inverting input of described second operational amplifier; 4th pin is connected with the second end of described 8th resistance;
Wherein, described secondary side sampled signal amplifying circuit comprises, the 9th resistance, the tenth resistance, the 11 resistance, the 12 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 described 9th resistance, the second end is connected with the first end of described tenth resistance, the in-phase input end of described 3rd operational amplifier and the 5th pin of described linear optical coupling respectively;
Second end of described tenth resistance is connected with the second end of described second electric capacity and connects public terminal GND;
The first end of described 11 resistance is connected with the inverting input of described 3rd operational amplifier, and the second end is connected with the output of described 3rd operational amplifier;
Described 5th electric capacity and described 11 resistor coupled in parallel;
The first end of described 12 resistance is connected with the output of described 3rd operational amplifier, and the second end is connected with the first end of described second electric capacity and the first end of described first resistance.
As shown from the above technical solution, the invention discloses a kind of output voltage regulation circuit and use the power supply of output voltage regulation circuit, comprise, loop of power circuit circuit, also comprise, feedback control loop, feedback control loop comprises voltage sampling circuit, voltage regulator circuit, voltage detecting feedback circuit and control circuit, wherein, the voltage signal of voltage sampling circuit Gather and input, voltage regulator circuit compares according to the voltage signal of input and the reference voltage preset, the reference voltage signal of output feedack loop, voltage detecting feedback circuit generates target output voltage signal according to the reference voltage signal of feedback control loop and output voltage information, control circuit regulates according to the output voltage of target output voltage signal to loop of power circuit circuit.Like this; output voltage is after voltage regulator circuit and voltage detecting feedback circuit regulate; linear regulation can be carried out according to the change of input voltage; keep output voltage precision high while realizing improving power-efficient; meanwhile, power module all remains Closed loop operation in full input voltage, there is not the switching state of Open loop and closed loop; so stability is also very high, and then protection late-class circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structural representation of a kind of output voltage regulation circuit that Fig. 1 provides for the embodiment of the present application one;
The structural representation of a kind of output voltage regulation circuit that Fig. 2 provides for the embodiment of the present application two;
The structural representation of the another kind of output voltage regulation circuit that Fig. 3 provides for the embodiment of the present application two;
The structural representation of the another kind of output voltage regulation circuit that Fig. 4 provides for the embodiment of the present application two.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
The structural representation of a kind of output voltage regulation circuit that Fig. 1 provides for the embodiment of the present application one, output voltage regulation circuit in the embodiment of the present application can be applied in switch converters, switch converters is the core component of modern transformation of electrical energy technology, also be the basic composition unit of the systems such as all kinds of power supply, frequency converter, UPS, photovoltaic generation, wind power generation, LED illumination, be widely used in the fields such as electric power, communication, household electrical appliances, railway traffic, automotive electronics, Industry Control, instrument and meter, Aeronautics and Astronautics, navigation.
In order to realize keeping voltage stabilization while raising power-efficient, in the present embodiment, output voltage regulation circuit comprises, loop of power circuit circuit 101, and loop of power circuit circuit is the modular circuit that in prior art, power module is conventional, does not repeat them here.
Output voltage regulation circuit also comprises, feedback control loop 100, and feedback control loop 100 comprises: voltage sampling circuit 102, 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 described loop of power circuit circuit 101, for the voltage signal of Gather and input.The voltage signal of input voltage sample circuit 102 Gather and input can comprise: carry out rectifying and wave-filtering after using the auxiliary winding sampling of main transformer and obtain, this current rectifying and wave filtering circuit adopts corresponding current rectifying and wave filtering circuit according to the difference of main power topological circuit; Or obtain after the signal on the main power winding of sampling transformer carries out rectifying and wave-filtering; Or Direct Sampling input voltage.Can find out, voltage sampling circuit 102 is after the voltage signal by input of directly or indirectly sampling, and the voltage signal of sampling input is outputted to voltage regulator circuit.
Voltage regulator circuit 104, the input of voltage regulator circuit 104 is connected with the output of voltage sampling circuit 102, for receiving the voltage signal of input, the relatively voltage signal of input and the size of the reference voltage signal preset, and the reference voltage signal of described feedback control loop is exported according to comparative result.
In the embodiment of the present application, voltage regulator circuit 104 voltage regulator circuit 104 is judged with after the reference voltage signal preset by the voltage signal of the input of sampling, and judgment mode can comprise following manner:
When the voltage signal of the input of sampling is less than default reference voltage signal, in voltage regulator circuit, the output level of amplifier reduces, and linearly turns down preconditioning voltage signal along with the voltage signal reduction of input simultaneously.When the voltage signal inputted from be less than default reference voltage signal to be more than or equal to reference voltage signal raise time, same also linearly along with the rising of input voltage signal can heighten preconditioning voltage signal.
Turned down by the reference voltage signal of feedback control loop, object is the change of regulation output voltage follow input voltage, makes power supply also carry out Closed loop operation at input voltage signal lower than during the reference voltage preset.Output voltage overshoot that power supply easily occurs when opened loop control is switched to closed-loop control can be solved or the problem such as to drop; during guarantee input voltage mutation, output voltage is relatively stable; not triggering voltage protection, the device of further protection power source itself and late-class circuit is not damaged.
When the voltage signal of the input of sampling is more than or equal to default reference voltage signal, the level exported in voltage regulator circuit 104 is equal to or higher than default reference voltage signal, because the output of output voltage regulation circuit 104 is connected by a backward diode with the reference voltage signal end preset, therefore the reference voltage signal that the preconditioning voltage signal that the output of output voltage regulation circuit exports still is preset, feedback control loop feeds back according to loop reference voltage signal, and output voltage stabilization voltage exports.
Voltage detecting feedback circuit 105, the input of voltage detecting feedback circuit 105 is connected with the output of the output of voltage regulator circuit 104 and loop of power circuit circuit 101, for the output voltage signal of the reference voltage signal and loop of power circuit circuit 101 that receive feedback control loop, and generate target output voltage signal according to the reference voltage signal of feedback control loop and output voltage signal.
Voltage detecting feedback circuit 105 is the inverting inputs by being input to amplifier after resistance detection output voltage, by negative-feedback regu-lation COMP terminal voltage, and then passes through the output voltage of control circuit 103 regulating power loop circuit 101.Voltage detecting feedback circuit can comprise two kinds: the circuit 1, using amplifier feedback; 2, the circuit using shunt regulator (TLV431) to feed back.
Can find out, when the voltage signal inputted is less than default reference voltage signal, the feedback control loop reference voltage signal in voltage detecting feedback circuit 105 follows the linear change of voltage regulator circuit 104 and linear change.
Control circuit 103, the output of control circuit 103 is connected with the input of loop of power circuit circuit 101, for receiving target regulation voltage signal, and controls the output voltage of loop of power circuit circuit 101 according to target regulated voltage Signal Regulation.
As can be seen from technique scheme, output voltage regulation circuit disclosed in the embodiment of the present application can regulate output voltage according to the change of input voltage, and, because the output voltage regulation circuit in the embodiment of the present application is that the components accuracy of each circuit on middle feedback control loop is all very high, therefore, can while guarantee power supply delivery efficiency, the precision exported is very high, simultaneously, power module all remains Closed loop operation in full input voltage, there is not the switching state of Open loop and closed loop, so stability is also very high.
On the other hand, output voltage regulation circuit in the embodiment of the present application is owing to being not use input voltage sampling resistor, electric capacity and control chip jointly to generate feedforward triangular wave, output voltage adjustment is carried out by feedforward triangular wave, because the error of electric capacity and control chip is larger, so the deviation of triangular wave is also comparatively large, and then cause the precision of output voltage poor.Use resistance sampling input voltage in the embodiment of the present application, and sampled value is controlled the feedback control loop of power supply more afterwards, its precision is higher.Therefore, the output voltage regulation circuit in the embodiment of the present application can more accurate regulation output voltage.
Embodiment two
The structural representation of a kind of output voltage regulation circuit that Fig. 2 provides for the embodiment of the present application one, in the present embodiment, voltage regulator circuit 104 comprises, the first diode VD1, the first operational amplifier D1, the first resistance R1, the second resistance R2 and the first electric capacity C1 and the second electric capacity C2;
The negative electrode of the first diode VD1 is connected with the output of the first operational amplifier D1, and inverting input and the voltage detecting feedback circuit 105 of anode and the first operational amplifier D1 are connected;
First resistance R1 first end is connected with the first end of the second electric capacity C2, second end is connected with the in-phase input end of the first end of the second resistance R2, the first end of the first electric capacity C1 and the first operational amplifier D1 respectively, and second end of the second resistance R2 is connected with second end of the first electric capacity C1 and connects public terminal GND;
The second termination public terminal GND of the second electric capacity C2.
Preferably, as shown in Figure 2,
Voltage sampling circuit 102 comprises: the secondary of main transformer T1 assists winding, the second diode VD2, the 3rd diode VD3, the 4th diode VD4, the 5th diode VD5 and the second electric capacity C2;
Secondary assists the Same Name of Ends of winding to be connected with the anode of the second diode VD2 and the negative electrode of the 4th diode VD4 respectively, and different name end is connected with the anode of the 3rd diode VD3 and the negative electrode of the 5th diode VD5 respectively;
The first end of the second electric capacity C2 is connected with the negative electrode of the second diode VD2, the negative electrode of the 3rd diode VD3 and voltage regulator circuit 104 respectively, and the second end is connected with the anode of the 4th diode VD4 and the anode of the 5th diode VD5 and connects public terminal GND respectively.
In the present embodiment, because secondary side assists the pulsewidth of winding corresponding with former limit input voltage with amplitude, therefore, the DC level obtained after carrying out rectifying and wave-filtering by the pulsewidth waveform of Circuit Fault on Secondary Transformer of sampling is directly proportional to input voltage.When input voltage reduces, it is maximum that supervisor due to primary side drives pulsewidth to arrive, so the pulse duration of transformer remains unchanged along with the reduction of input voltage, but the pulse amplitude of transformer reduces along with the reduction of input voltage, so the level obtained after Circuit Fault on Secondary Transformer being assisted the voltage waveform on winding to carry out rectifying and wave-filtering also just linearly reduces along with the reduction of input voltage.And then the input voltage sampled signal obtained also is followed the reduction of input voltage and linearly reduces, then a kind of according to embodiment regulative mode carries out the adjustment of output voltage.Avoid power supply and work in open loop situations in full voltage range inner feedback loop.
Preferably, as shown in Figure 3,
Voltage sampling circuit 102 comprises, transformer T1 secondary main winding, the 6th diode VD6;
The anode of the 6th diode VD6 is connected with the centre cap of described transformer secondary main winding, and negative electrode is connected with the first end of the second electric capacity C2.
Use above-mentioned sample circuit, the device of sample circuit is few, and it does not need to increase new Transformer Winding and samples, save the volume of power supply, avoid the problem that cross regulation rate that winding that extra Transformer Winding causes and being coupled between winding cause is larger simultaneously.
Preferably, as shown in Figure 4,
Voltage sampling circuit 102 comprises, primary side sample circuit 401, sampled signal transfer circuit 402, secondary side sampled signal amplifying circuit 403;
Wherein, primary side sample circuit 401 comprises, the 3rd resistance 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 accessory power supply VCC1;
The first end sampled input voltage signal of the 3rd resistance R3, the second end is connected with the first end of the 4th resistance R4 and the first end of described 6th resistance R6 respectively;
3rd electric capacity C3 is in parallel with the 4th resistance R4;
Second end of the 4th resistance R4 is connected with second end of the 5th resistance R5 and connects public terminal GND;
The first end of the 5th resistance R5 is connected with the in-phase input end of the second operational amplifier D2 and second end of the 8th resistance R8 respectively;
Second end of the 6th resistance R6 is connected with the inverting input of the second operational amplifier D2;
The first end of the 4th electric capacity C4 is connected with the inverting input of the second operational amplifier D2, and the second end is connected with the output of the second operational amplifier D2;
The voltage signal of second end of the 8th resistance R8 sampling should be carried out side accessory power supply VCC1;
The first end of the 7th resistance R7 is connected with the output of the second operational amplifier D2;
Wherein, described sampled signal transfer circuit 402 comprises, linear optical coupling D3;
First pin of linear optical coupling D3 is connected with second end of the 7th resistance R7, and crus secunda is connected with primary side accessory power supply VCC1, and tripod is connected with the inverting input of the second operational amplifier D2; 4th pin is connected with second end of the 8th resistance R8;
Wherein, secondary side sampled signal amplifying circuit 403 comprises, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12, secondary side accessory power supply VCC2, the 3rd operational amplifier D4, the 5th electric capacity C5;
The voltage signal of the first end sampling secondary side accessory power supply VCC2 of the 9th resistance R9, the second end is connected with the 5th pin of the first end of the tenth resistance R10, the in-phase input end of the 3rd operational amplifier D4 and linear optical coupling D3 respectively;
Second end of the tenth resistance R10 is connected with second end of the second electric capacity C2 and connects public terminal GND;
The first end of the 11 resistance R11 is connected with the inverting input of described 3rd operational amplifier D4, and the second end is connected with the output of the 3rd operational amplifier D4;
5th electric capacity C5 is in parallel with the 11 resistance R11;
The first end of the 12 resistance R12 is connected with the output of the 3rd operational amplifier D4, and the second end is connected with the first end of the second electric capacity C2 and the first end of the first resistance R1.
The program is by being delivered to secondary side by sampled signal after Direct Sampling input voltage, secondary side outputs to output voltage regulation circuit after being amplified by the input voltage signal received, and then output voltage regulation circuit is according to input voltage signal regulation output voltage.When input voltage reduces, the current signal fed back with linear optical coupling of sampling is carried out integration by electric capacity C4 by amplifier D3, then the output of amplifier D3 exports the magnitude of voltage being integrated into ratio with input voltage, this magnitude of voltage is input to linear optical coupling, makes the current signal of linear optical coupling reduce along with input voltage and reduce; The secondary side of linear optical coupling detects the current signal that primary side transmits, the signal this current signal being input to secondary side amplifies amplifier D4, D4 exports a galvanic current after the current signal received is carried out a certain proportion of amplification and puts down, along with the reduction of input voltage, the delivered current of linear optical coupling primary side reduces, current signal that its secondary side receives reduces, then the output voltage of amplifier D4 reduces, thus the output voltage of secondary side D4 and the input voltage of primary side in direct ratio.After sampling input voltage signal, the regulative mode according to a kind of record of embodiment regulates.
The application discloses a kind of power supply on the other hand, comprises the output voltage regulation circuit in above-mentioned any embodiment.Obviously, the power supply applying the output voltage regulation circuit in above-mentioned any embodiment can reach the technique effect identical with aforementioned output voltage regulation circuit, does not repeat them here.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. an output voltage regulation circuit, comprises, and loop of power circuit circuit, is characterized in that, also comprises, feedback control loop, and described feedback control loop comprises:
Voltage sampling circuit, the input of described voltage sampling circuit is connected with the input of described loop of power circuit circuit, for the voltage signal of Gather and input;
Voltage regulator circuit, the input of described voltage regulator circuit is connected with the output of described voltage sampling circuit, for receiving the voltage signal of described input, the voltage signal of more described input and the size of the reference voltage signal preset, and the reference voltage signal of described feedback control loop is exported according to comparative result;
Voltage detecting feedback circuit, the input of described voltage detecting feedback circuit is connected with the output of the output of described voltage regulator circuit and described loop of power circuit circuit, for the output voltage signal of the reference voltage signal and described loop of power circuit circuit that receive described feedback control loop, and generate target output voltage signal according to the reference voltage signal of described feedback control loop and described output voltage signal;
Control circuit, the output of described control circuit is connected with the input of described loop of power circuit circuit with the output of described voltage detecting feedback circuit respectively, for receiving described target output voltage signal, and according to described target output voltage Signal Regulation the output voltage of loop of power circuit circuit.
2. output voltage regulation circuit according to claim 1, is characterized in that, described voltage regulator circuit comprises, the first diode, the first operational amplifier, the first resistance, the second resistance and the first electric capacity and the second electric capacity;
The negative electrode of described first diode is connected with the output of described first operational amplifier, and inverting input and the described voltage detecting feedback circuit of anode and described first operational amplifier are connected;
Described first resistance first end is connected with the first end of described second electric capacity, second end is connected with the in-phase input end of the first end of described second resistance, the first end of described first electric capacity and described first operational amplifier respectively, and the second end of described second resistance is connected with the second end of described first electric capacity and connects public terminal GND;
Second termination public terminal GND of described second electric capacity.
3. output voltage regulation circuit according to claim 2, is characterized in that,
Described voltage sampling circuit comprises: the secondary of main transformer assists winding, the second diode, the 3rd diode, the 4th diode, the 5th diode;
Described secondary assists the Same Name of Ends of winding to be connected with the anode of described second diode and the negative electrode of described 4th diode respectively, and different name end is connected with the anode of described 3rd diode and the negative electrode of described 5th diode respectively;
The first end of described second electric capacity is connected with the negative electrode of described second diode, the negative electrode of described 3rd diode and described voltage regulator circuit respectively, and the second end is connected with the anode of described 4th diode and the anode of described 5th diode and connects public terminal GND respectively.
4. output voltage regulation circuit according to claim 2, is characterized in that,
Described voltage sampling circuit comprises, transformer secondary main winding, the 6th diode;
The anode of described 6th diode is connected with the centre cap of described transformer secondary main winding, and negative electrode is connected with the first end of described second electric capacity;
Described second electric capacity second end is connected with public terminal GND.
5. output voltage regulation circuit according to claim 2, is characterized in that,
Described voltage sampling circuit comprises, primary side sample circuit, sampled signal transfer circuit, secondary side sampled signal amplifying circuit;
Wherein, described primary side sample circuit comprises, the 3rd resistance, 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 described 3rd resistance, the second end is connected with the first end of described 4th resistance and the first end of described 6th resistance respectively;
Described 3rd electric capacity and described 4th resistor coupled in parallel;
Second end of described 4th resistance is connected with the second end of described 5th resistance and connects public terminal GND;
The first end of described 5th resistance is connected with the in-phase input end of described second operational amplifier and the second end of described 8th resistance respectively;
Second end of described 6th resistance is connected with the inverting input of described second operational amplifier;
The first end of described 4th electric capacity is connected with the inverting input of described second operational amplifier, and the second end is connected with the output of described second operational amplifier;
Second end of described 8th resistance is sampled the voltage signal of described primary side accessory power supply;
The first end of described 7th resistance is connected with the output of described second operational amplifier;
Wherein, described sampled signal transfer circuit comprises, linear optical coupling;
First pin of described linear optical coupling is connected with the second end of described 7th resistance, and crus secunda is connected with described primary side accessory power supply, and tripod is connected with the inverting input of described second operational amplifier; 4th pin is connected with the second end of described 8th resistance;
Wherein, described secondary side sampled signal amplifying circuit comprises, the 9th resistance, the tenth resistance, the 11 resistance, the 12 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 described 9th resistance, the second end is connected with the first end of described tenth resistance, the in-phase input end of described 3rd operational amplifier and the 5th pin of described linear optical coupling respectively;
Second end of described tenth resistance is connected with the second end of described second electric capacity and connects public terminal GND;
The first end of described 11 resistance is connected with the inverting input of described 3rd operational amplifier, and the second end is connected with the output of described 3rd operational amplifier;
Described 5th electric capacity and described 11 resistor coupled in parallel;
The first end of described 12 resistance is connected with the output of described 3rd operational amplifier, and the second end is connected with the first end of described second electric capacity and the first end of described first resistance.
6. a power supply, is characterized in that, comprises, output voltage regulation circuit;
Described output voltage regulation circuit comprises, and loop of power circuit circuit, also comprises, feedback control loop, and described feedback control loop comprises:
Voltage sampling circuit, the input of described voltage sampling circuit is connected with the input of described loop of power circuit circuit, for the voltage signal of Gather and input;
Voltage regulator circuit, the input of described voltage regulator circuit is connected with the output of described voltage sampling circuit, for receiving the voltage signal of described input, the voltage signal of more described input and the size of the reference voltage signal preset, and the reference voltage signal of described feedback control loop is exported according to comparative result;
Voltage detecting feedback circuit, the input of described voltage detecting feedback circuit is connected with the output of the output of described voltage regulator circuit and described loop of power circuit circuit, for the output voltage signal of the reference voltage signal and described loop of power circuit circuit that receive described feedback control loop, and generate target output voltage signal according to the reference voltage signal of described feedback control loop and described output voltage signal;
Control circuit, the output of described control circuit is connected with the input of described loop of power circuit circuit with the output of described voltage detecting feedback circuit respectively, for receiving described target output voltage signal, and according to described target output voltage Signal Regulation the output voltage of loop of power circuit circuit.
7. power supply according to claim 6, is characterized in that, described voltage regulator circuit comprises, the first diode, the first operational amplifier, the first resistance, the second resistance and the first electric capacity and the second electric capacity;
The negative electrode of described first diode is connected with the output of described first operational amplifier, and inverting input and the described voltage detecting feedback circuit of anode and described first operational amplifier are connected;
Described first resistance first end is connected with the first end of described second electric capacity, second end is connected with the in-phase input end of the first end of described second resistance, the first end of described first electric capacity and described first operational amplifier respectively, and the second end of described second resistance is connected with the second end of described first electric capacity and connects public terminal GND;
Second termination public terminal GND of described second electric capacity.
8. power supply according to claim 7, is characterized in that,
Described voltage sampling circuit comprises: the secondary of main transformer assists winding, the second diode, the 3rd diode, the 4th diode, the 5th diode;
Described secondary assists the Same Name of Ends of winding to be connected with the anode of described second diode and the negative electrode of described 4th diode respectively, and different name end is connected with the anode of described 3rd diode and the negative electrode of described 5th diode respectively;
The first end of described second electric capacity is connected with the negative electrode of described second diode, the negative electrode of described 3rd diode and described voltage regulator circuit respectively, and the second end is connected with the anode of described 4th diode and the anode of described 5th diode and connects public terminal GND respectively.
9. power supply according to claim 7, is characterized in that,
Described voltage sampling circuit comprises, transformer secondary main winding, the 6th diode;
The anode of described 6th diode is connected with the centre cap of described transformer secondary main winding, and negative electrode is connected with the first end of described second electric capacity;
Described second electric capacity second end is connected with public terminal GND.
10. power supply according to claim 7, is characterized in that,
Described voltage sampling circuit comprises, primary side sample circuit, sampled signal transfer circuit, secondary side sampled signal amplifying circuit;
Wherein, described primary side sample circuit comprises, the 3rd resistance, 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 described 3rd resistance, the second end is connected with the first end of described 4th resistance and the first end of described 6th resistance respectively;
Described 3rd electric capacity and described 4th resistor coupled in parallel;
Second end of described 4th resistance is connected with the second end of described 5th resistance and connects public terminal GND;
The first end of described 5th resistance is connected with the in-phase input end of described second operational amplifier and the second end of described 8th resistance respectively;
Second end of described 6th resistance is connected with the inverting input of described second operational amplifier;
The first end of described 4th electric capacity is connected with the inverting input of described second operational amplifier, and the second end is connected with the output of described second operational amplifier;
Second end of described 8th resistance is sampled the voltage signal of described primary side accessory power supply;
The first end of described 7th resistance is connected with the output of described second operational amplifier;
Wherein, described sampled signal transfer circuit comprises, linear optical coupling;
First pin of described linear optical coupling is connected with the second end of described 7th resistance, and crus secunda is connected with described primary side accessory power supply, and tripod is connected with the inverting input of described second operational amplifier; 4th pin is connected with the second end of described 8th resistance;
Wherein, described secondary side sampled signal amplifying circuit comprises, the 9th resistance, the tenth resistance, the 11 resistance, the 12 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 described 9th resistance, the second end is connected with the first end of described tenth resistance, the in-phase input end of described 3rd operational amplifier and the 5th pin of described linear optical coupling respectively;
Second end of described tenth resistance is connected with the second end of described second electric capacity and connects public terminal GND;
The first end of described 11 resistance is connected with the inverting input of described 3rd operational amplifier, and the second end is connected with the output of described 3rd operational amplifier;
Described 5th electric capacity and described 11 resistor coupled in parallel;
The first end of described 12 resistance is connected with the output of described 3rd operational amplifier, and the second end is connected with the first end of described second electric capacity and the first end of described first resistance.
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| CN105048815B (en) | 2017-11-24 |
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