CN113852274A - Switching power supply far-end compensation circuit and switching power supply - Google Patents
Switching power supply far-end compensation circuit and switching power supply Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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Abstract
The invention provides a switching power supply far-end compensation circuit and a switching power supply. The switching power supply remote compensation circuit comprises: the sampling signal conversion module and the partial pressure adjusting module; the sampling signal conversion module is connected with a first input end and an output voltage sampling end of the target switching power supply, a second input end and a third input end are respectively connected with a positive end and a negative end of a far-end correction point of the target switching power supply, and a first output end and a second output end are respectively connected with a first input end and a second input end of the voltage division adjusting module; and the output end of the voltage division adjusting module is connected with the target switch power supply through the voltage feedback adjusting module. According to the invention, the sampling signal conversion module is used for carrying out voltage signal conversion on the output voltage sampling signal and the voltage signal of the remote correction point, so that the common-mode voltage interference of the sampling signal can be reduced; the voltage division regulation is carried out through the voltage division regulation module independent of the voltage feedback regulation module, the output voltage of the target switching power supply is corrected, the regulation precision is high, and the flexibility is good.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a switching power supply far-end compensation circuit and a switching power supply.
Background
In high power supply applications, as the output current of the power supply increases, the voltage drop of the power supply cable between the power supply output terminal and the input terminal of the consumer will increase significantly, especially when the power supply cable is long. When the electrical equipment is sensitive to the input voltage, the cable voltage drop will have some undesirable consequences, and in order to avoid such a situation, the voltage drop existing on the cable needs to be corrected and compensated to meet the expected voltage.
The existing remote compensation circuits include the following:
(1) the voltage of the far-end correction point is directly collected and directly acted on the control circuit as output feedback voltage, so that the voltage output of the power supply is adjusted.
(2) The voltage drop of the positive end and the negative end of the power supply cable is collected and processed at the same time and participates in the adjustment of the output voltage of the power supply as a part of voltage feedback, so that the voltage drop of the power supply cable is eliminated.
(3) The feedback-line-free far-end compensation circuit performs differential amplification processing on a detected current signal through the magnitude of the loop current in the output current sampling detection circuit, feeds back a correction signal, and the regulation and control circuit regulates the output voltage value of the power supply body according to the magnitude of the correction signal.
In the remote compensation circuit, on one hand, a sampling signal is easily interfered by common-mode voltage, and on the other hand, the sampling signal directly participates in the adjustment of the output voltage of the power supply, so that the flexibility is poor, and the remote compensation circuit cannot be widely applied.
Disclosure of Invention
The embodiment of the invention provides a switching power supply far-end compensation circuit and a switching power supply, and aims to solve the problems that the existing switching power supply far-end compensation circuit is easily interfered by common-mode voltage, has poor flexibility and cannot be widely applied.
In a first aspect, an embodiment of the present invention provides a far-end compensation circuit for a switching power supply, including: the sampling signal conversion module and the partial pressure adjusting module;
the sampling signal conversion module is connected with the output voltage sampling end of a target switch power supply at a first input end, is connected with the positive end of the remote correction point of the target switch power supply at a second input end, is connected with the negative end of the remote correction point of the target switch power supply at a third input end, is connected with the first input end of the partial pressure regulating module at a first output end, and is connected with the second input end of the partial pressure regulating module at a second output end; the sampling signal conversion module is used for performing voltage signal conversion on the output voltage sampling signal of the target switching power supply and the voltage signal of the remote correction point to reduce common-mode voltage interference;
the positive power supply end of the voltage division adjusting module is used for inputting a preset power supply, the negative power supply end of the voltage division adjusting module is grounded, and the output end of the voltage division adjusting module is connected with the target switch power supply through the voltage feedback adjusting module; the voltage division adjusting module is used for carrying out differential amplification on the converted voltage signal and carrying out voltage division adjustment on the voltage feedback adjusting module by utilizing the voltage signal subjected to differential amplification so as to correct the output voltage of the target switching power supply.
In one possible implementation manner, the voltage division adjusting module includes a differential amplifying unit and a voltage division adjusting unit;
the differential amplification unit has a first input end serving as a first input end of the partial pressure regulation module, a second input end serving as a second input end of the partial pressure regulation module, a positive power supply end serving as a positive power supply end of the partial pressure regulation module, a negative power supply end serving as a negative power supply end of the partial pressure regulation module, and an output end connected with the input end of the partial pressure regulation unit;
and the output end of the partial pressure adjusting unit is used as the output end of the partial pressure adjusting module.
In one possible implementation, the differential amplifying unit includes: the circuit comprises a resistor R11, a resistor R15, a resistor R18, a capacitor C8 and a differential operational amplifier U5;
the first end of the resistor R11 is used as the first input end of the differential amplification unit, and the second end of the resistor R11 is connected with the non-inverting input end of the differential operational amplifier U5;
the resistor R15 has a first end serving as a second input end of the differential amplification unit, and a second end respectively connected with the inverting input end of the differential operational amplifier U5, the first end of the resistor R18 and the first end of the capacitor C8;
in the differential operational amplifier U5, a positive power supply terminal is used as a positive power supply terminal of the differential amplification unit, a negative power supply terminal is used as a negative power supply terminal of the differential amplification unit, and an output terminal is connected to the second terminal of the resistor R18 and the second terminal of the capacitor C8 and then is used as an output terminal of the differential amplification unit.
In one possible implementation, the partial pressure adjusting unit includes: a voltage dividing resistor R10;
the first end of the voltage division resistor R10 is used as the first end of the voltage division adjusting unit, and the second end is used as the second end of the voltage division adjusting unit.
In one possible implementation, the sampling signal conversion module includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a triode N1, a triode N2, a capacitor C1, a capacitor C2, a voltage regulator tube U1 and a voltage regulator tube U2;
a first end of the resistor R1 is connected to a first end of the resistor R3 and then serves as a first input end of the sampling signal conversion module, and a second end of the resistor R1 is connected to an emitter of the triode N1;
the second end of the resistor R3 is respectively connected with the base electrode of the triode N1 and the negative electrode of the voltage regulator tube U2;
a collector of the triode N1 is connected to the first end of the resistor R5 and the first end of the capacitor C1, respectively, and then serves as a second output end of the sampling signal conversion module;
the anode of the voltage regulator tube U2 is connected with the second end of the resistor R5, the second end of the capacitor C1, the second end of the resistor R6 and the second end of the capacitor C2 and then grounded;
the first end of the resistor R2 is connected with the first end of the resistor R4 and then serves as the second input end of the sampling signal conversion module, and the second end of the resistor R2 is connected with the emitter of the triode N2;
the second end of the resistor R4 is respectively connected with the base electrode of the triode N2 and the negative electrode of the voltage regulator tube U1;
a collector of the triode N2 is connected to the first end of the resistor R6 and the first end of the capacitor C2, respectively, and then serves as a first output end of the sampling signal conversion module;
and the anode of the voltage regulator tube U1 is used as a third input end of the sampling signal conversion module.
In one possible implementation, the transistor N1 and the transistor N2 are both P-type transistors, and the transistor N1 and the transistor N2 are absolutely symmetric.
In a possible implementation manner, the sampling signal conversion module further includes a third output terminal;
the voltage division adjusting module further comprises a switch unit;
and the first end of the switch unit is connected with the output end of the differential amplification unit, the second end of the switch unit is connected with the input end of the partial pressure regulation unit, the third end of the switch unit is connected with the third output end of the sampling signal conversion module, and the fourth end of the switch unit is grounded.
In a possible implementation manner, a second end of the resistor R4 is connected to the base of the transistor N2 and the negative electrode of the regulator tube U1, respectively, and then serves as a third output end of the sampling signal conversion module;
the switching unit includes: a switch tube N3, a resistor R12, a resistor R19 and a voltage regulator tube Z1;
the source electrode of the switch tube N3 is used as the first end of the switch unit, the drain electrode is used as the second end of the switch unit, and the grid electrode is respectively connected with the first end of the resistor R12, the first end of the resistor R19 and the negative electrode of the voltage regulator tube Z1;
the resistor R12 has a second terminal as a third terminal of the switch unit;
and the second end of the resistor R19 is connected with the anode of the voltage regulator tube Z1 and then serves as the fourth end of the switch unit.
In a second aspect, an embodiment of the present invention provides a switching power supply, including the switching power supply remote compensation circuit described in the first aspect or any one of the possible implementation manners of the first aspect.
In one possible implementation, the switching power supply further includes: a voltage feedback regulation module;
the voltage feedback adjustment module includes: a resistor R17 and a differential operational amplifier;
the first end of the resistor R17 is grounded, and the second end of the resistor R17 is connected with the inverting input end of the differential operational amplifier and then connected with the output end of a voltage division adjusting module in the switch power supply far-end compensation circuit;
the non-inverting input end of the differential operational amplifier is connected with reference voltage, the positive power supply end is used for inputting working voltage, the negative power supply end is grounded, and the output end of the differential operational amplifier is connected with the target switch power supply.
The embodiment of the invention provides a switching power supply far-end compensation circuit and a switching power supply, which comprise a sampling signal conversion module and a voltage division regulation module, wherein the sampling signal conversion module is connected with a first input end of an output voltage sampling end of a target switching power supply, a second input end of the sampling signal conversion module is connected with a positive end of a far-end correction point of the target switching power supply, a third input end of the sampling signal conversion module is connected with a negative end of the far-end correction point of the target switching power supply, a first output end of the sampling signal conversion module is connected with a first input end of the voltage division regulation module, and a second output end of the sampling signal conversion module is connected with a second input end of the voltage division regulation module; and the positive power supply end is used for inputting a preset power supply, the negative power supply end is grounded, and the output end is connected with the target switch power supply through the voltage feedback adjusting module. The switch power supply far-end compensation circuit provided by the invention can convert the voltage signal of the output voltage sampling signal and the voltage signal of the far-end correction point of the target switch power supply through the sampling signal conversion module, thereby reducing the common-mode voltage interference of the sampling signal; the voltage division adjusting module independent of the voltage feedback adjusting module is used for carrying out differential amplification on the converted voltage signal, and the voltage division adjusting module is used for carrying out voltage division adjustment on the voltage feedback adjusting module by utilizing the voltage signal subjected to differential amplification, so that the output voltage of the target switching power supply is corrected, and the voltage division adjusting module is high in adjusting precision and good in flexibility.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a remote compensation circuit of a switching power supply according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power transmission circuit provided by an embodiment of the invention;
fig. 3 is a schematic structural diagram of a sampling signal conversion module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a partial pressure adjusting module according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a remote compensation circuit of a switching power supply according to an embodiment of the present invention. As shown in fig. 1, the switching power supply remote compensation circuit includes: a sampling signal conversion module 100 and a voltage division adjusting module 200.
The sampling signal conversion module 100 has a first input end connected to the output voltage sampling end of the target switching power supply, a second input end connected to the positive end of the remote calibration point of the target switching power supply, a third input end connected to the negative end of the remote calibration point of the target switching power supply, a first output end connected to the first input end of the voltage division adjusting module 200, and a second output end connected to the second input end of the voltage division adjusting module 200; the sampling signal conversion module 100 is configured to perform voltage signal conversion on the output voltage sampling signal of the target switching power supply and the voltage signal of the remote calibration point, so as to reduce common-mode voltage interference.
The voltage division adjusting module 200 is used for inputting a preset power supply at a positive power supply end, grounding at a negative power supply end and connecting an output end with a target switch power supply through a voltage feedback adjusting module; the voltage division adjusting module 200 is configured to perform differential amplification on the converted voltage signal, and perform voltage division adjustment on the voltage feedback adjusting module by using the voltage signal after differential amplification, so as to correct the output voltage of the target switching power supply.
With reference to fig. 2, the power supply body may be a part including a target switching power supply, an output voltage sampling module, a switching power supply remote compensation circuit, and a voltage feedback adjustment module, wherein Vout + is an output voltage sampling terminal, R22 represents a power supply output positive cable equivalent resistance, R23 represents a power supply output negative cable equivalent resistance, S + is a remote calibration point positive terminal, and S-is a remote calibration point negative terminal. According to the switch power supply far-end compensation circuit, the voltage signal conversion can be carried out on the output voltage sampling signal of the target switch power supply and the voltage signal of the far-end correction point through the sampling signal conversion module, and the common-mode voltage interference of the sampling signal is reduced; the voltage division adjusting module independent of the voltage feedback adjusting module is used for carrying out differential amplification on the converted voltage signal, and the voltage division adjusting module is used for carrying out voltage division adjustment on the voltage feedback adjusting module by utilizing the voltage signal subjected to differential amplification, so that the output voltage of the target switching power supply is corrected, and the voltage division adjusting module is high in adjusting precision and good in flexibility.
Alternatively, referring to fig. 3, the sampling signal conversion module 100 includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a triode N1, a triode N2, a capacitor C1, a capacitor C2, a voltage regulator tube U1 and a voltage regulator tube U2.
And a first end of the resistor R1 is connected with a first end of the resistor R3 and then serves as a first input end of the sampling signal conversion module, and is connected with an output voltage sampling end Vout + of the target switching power supply, and a second end of the resistor R1 is connected with an emitter of the triode N1.
And the second end of the resistor R3 is respectively connected with the base electrode of the triode N1 and the negative electrode of the voltage regulator tube U2.
And a collector of the triode N1 is respectively connected with the first end of the resistor R5 and the first end of the capacitor C1 and then serves as a second output end of the sampling signal conversion module.
And the anode of the voltage regulator tube U2 is connected with the second end of the resistor R5, the second end of the capacitor C1, the second end of the resistor R6 and the second end of the capacitor C2 and then grounded.
And a first end of the resistor R2 is connected with a first end of the resistor R4 and then serves as a second input end of the sampling signal conversion module, and is connected with a far-end correction point positive end S +, and a second end of the resistor R2 is connected with an emitter of the triode N2.
And the second end of the resistor R4 is respectively connected with the base electrode of the triode N2 and the negative electrode of the voltage regulator tube U1.
And a collector of the triode N2 is respectively connected with the first end of the resistor R6 and the first end of the capacitor C2 and then serves as a first output end of the sampling signal conversion module.
And the anode of the voltage-stabilizing tube U1 is used as the third input end of the sampling signal conversion module and is connected with the negative end S-of the far-end correction point.
Optionally, the transistor N1 and the transistor N2 are both P-type transistors, and the transistor N1 and the transistor N2 are absolutely symmetric.
The two P-type transistors N1 and N2 can be packaged together to ensure absolute symmetry.
In this embodiment, the output port of the target switching power supply samples voltage VOUTThe sampling voltage at the far-end correction point is VSThe voltages of the voltage-regulator tubes U1 and U2 are V respectivelyU1And VU2The eb pole tube voltage drop of the P-type triodes N1 and N2 is Veb1And Veb2And then:
voltage across resistor R5
Voltage across resistor R6
Thereby realizing the voltage signal V of the sampling portOUT、VSThe current signals are converted into current signals through triodes N1 and N2, the current signals are converted into voltage signals through resistors R5 and R6, and the voltage signals are directly coupled with a differential amplification circuit of a rear-end voltage division adjusting module for further processing.
The sampling signal conversion module of this embodiment samples the output port voltage and the far-end correction point voltage of target switching power supply respectively, and rethread resistance converts the input voltage signal of differential operational amplifier into, carries out differential amplification and handles, does not directly insert differential operational amplifier with the sampling voltage signal, can effectively reduce common mode voltage and disturb.
Optionally, referring to fig. 4, the voltage division adjusting module 200 includes a differential amplifying unit 201 and a voltage division adjusting unit 202.
The differential amplification unit 201 has a first input terminal S _ REF serving as a first input terminal of the voltage division adjusting module 200, a second input terminal B _ REF serving as a second input terminal of the voltage division adjusting module 200, a positive power terminal serving as a positive power terminal of the voltage division adjusting module 200, a negative power terminal serving as a negative power terminal of the voltage division adjusting module 200, and an output terminal connected to an input terminal of the voltage division adjusting unit 202; and the output end of the voltage division adjusting unit 202 is used as the output end of the voltage division adjusting module 200.
Optionally, the differential amplifying unit 201 includes: the circuit comprises a resistor R11, a resistor R15, a resistor R18, a capacitor C8 and a differential operational amplifier U5.
And a resistor R11, having a first terminal as a first input terminal of the differential amplifying unit 201 and a second terminal connected to the non-inverting input terminal of the differential operational amplifier U5.
And a resistor R15 having a first terminal serving as a second input terminal of the differential amplifying unit 201 and a second terminal connected to the inverting input terminal of the differential operational amplifier U5, the first terminal of the resistor R18 and the first terminal of the capacitor C8, respectively.
And a positive power supply end of the differential operational amplifier U5 is used as a positive power supply end of the differential amplification unit 201, a negative power supply end is used as a negative power supply end of the differential amplification unit 201, and an output end of the differential operational amplifier U5 is connected with a second end of the resistor R18 and a second end of the capacitor C8 and then is used as an output end of the differential amplification unit 201.
Optionally, the partial pressure adjusting unit 202 includes: a voltage dividing resistor R10.
The voltage dividing resistor R10 has a first terminal as a first terminal of the voltage dividing and adjusting unit 202, and a second terminal as a second terminal of the voltage dividing and adjusting unit 202.
Optionally, the sampling signal conversion module 100 further includes a third output terminal S _ 10; the voltage division adjusting module 200 further includes a switching unit 203.
A first end of the switching unit 203 is connected to the output end of the differential amplifying unit 201, a second end of the switching unit is connected to the input end of the voltage division adjusting unit 202, a third end of the switching unit is connected to the third output end S _10 of the sampling signal conversion module 100, and a fourth end of the switching unit is grounded.
Optionally, the second end of the resistor R4 is connected to the base of the transistor N2 and the negative electrode of the regulator tube U1, respectively, and then serves as the third output end S _10 of the sampling signal conversion module 100.
The switching unit 203 includes: a switch tube N3 and a voltage regulator tube Z1.
The source of the switch tube N3 is the first terminal of the switch unit 203, the drain is the second terminal of the switch unit 203, and the gate is connected to the first terminal of the resistor R12, the first terminal of the resistor R19 and the cathode of the regulator tube Z1.
And a second terminal of the resistor R12 is used as a third terminal of the switch unit 203.
And a second end of the resistor R19 is connected with the positive electrode of the voltage regulator tube Z1 and then serves as a fourth end 203 of the switching unit.
In this embodiment, the switching transistor N3 may be a small-signal MOS transistor, for example, an MOS transistor having a lower threshold voltage and being in a variable resistance region during operation. The voltage regulator tube Z1, the resistor R12 and the resistor R19 are driving circuits of small-signal MOS tubes, the voltage regulator tube Z1 is used for protecting the MOS tubes, the grid voltage of the MOS tubes cannot be damaged due to overhigh voltage, and the resistor R12 and the resistor R19 divide the voltage, so that the driving voltage is maintained in a driving voltage range corresponding to a variable resistance region of the MOS tubes during the working period of the MOS tubes. In the embodiment, the small signal MOS tube of the switch unit enables the whole switch power supply far-end compensation circuit, and the voltage V sampled from the far-end correction point is drivenSThe power is taken, the short circuit of the far-end correction point cannot cause the safety problem of the power supply, and the reliability is high.
The voltage dividing and adjusting module of this embodiment differentially amplifies the converted voltage signal, and then indirectly changes the voltage dividing resistance value thereof by coupling the source of the small-signal MOS transistor N3 and connecting the resistor R10 in parallel with the voltage dividing resistor R17 of the voltage feedback adjusting module, so as to correct the output voltage. The correction principle is as follows:
let R be11＝R15(to realize the basic function of the operational amplifier, the resistances of R11 and R15 are generally equal, which may be the actual case for the sake of accuracy), then:
output voltage of the differential operational amplifier U5:
the corrected output voltage of the power supply port is as follows:
wherein, VREFThe reference voltage given to the non-inverting input of the differential op-amp of the voltage feedback regulation module is typically 2.5V, RON_N3The resistor R13 and the resistor R9 are resistors of the voltage feedback regulating module connected to the inverting input end of the operational amplifier, and are used for conducting internal resistance of the switching tube N3.
Namely, the voltage division of the resistor R17 is changed to make it not equal to the reference voltage given by the non-inverting input terminal of the differential operational amplifier of the voltage feedback regulation module, and then the differential operational amplifier of the voltage feedback regulation module is triggered to control the switch of the corresponding switch tube, so as to stabilize the output voltage of the target switch power supply.
The partial pressure regulating module of this embodiment, the design has the distal end compensation line, compensation target switching power supply's that can be comparatively accurate output voltage, adjusts the precision height, and relatively independent with voltage feedback regulating module, can not influence original feedback loop during the parameter regulation, can utilize in a flexible way, and the flexibility is good, and only additionally adds an fortune and puts, and circuit structure is succinct, and is with low costs, but wide application.
Optionally, the differential amplifying unit 201 may further include a capacitor C4 and a resistor R7, a first end of the capacitor C4 is grounded, a second end of the capacitor C4 is connected to the first end of the resistor R7 and the positive power terminal of the differential operational amplifier U5, respectively, and a second end of the resistor R7 is used to connect to a preset power supply (e.g., +5V auxiliary power supply). The preset power supply is determined by the working voltage of the differential operational amplifier U5, and the capacitor C4 and the resistor R7 are used for filtering, so that the power supply of the differential operational amplifier U5 is stable.
The switch power supply far-end compensation circuit provided by the embodiment of the invention can be applied to a power supply needing far-end compensation. The sampling signal conversion module converts the voltage of an output port of the target switching power supply and the voltage of a far-end correction point into current signals respectively, then the current signals are converted into input voltage signals of the differential operational amplifier through the resistors, differential amplification processing is carried out, the sampling voltage signals are not directly connected into the differential operational amplifier, and common-mode voltage interference can be effectively reduced. Through the voltage division adjusting module, the converted voltage signal is subjected to differential amplification, and then the voltage division resistance value is indirectly changed by connecting the source electrode of the coupling small-signal MOS tube N3 with the resistor R10 in parallel with the voltage division resistor R17 of the voltage feedback adjusting module, so that the output voltage is corrected. The switch power supply far-end compensation circuit is enabled by the small-signal MOS tube, the switch power supply far-end compensation circuit drives the far-end correction point to sample voltage and get electricity, the far-end correction point is short-circuited, the problem of power supply safety is solved, and the reliability is high.
As another embodiment of the present invention, the present invention further includes a switching power supply, which includes the switching power supply remote compensation circuit described in any of the above embodiments, and has the same beneficial effects as the switching power supply remote compensation circuit described in any of the above embodiments.
Optionally, in conjunction with fig. 4, the switching power supply may further include a voltage feedback regulation module.
Wherein, the voltage feedback regulation module may include: a resistor R17 and a differential operational amplifier;
the first end of the resistor R17 is grounded, the second end of the resistor R17 is connected to the inverting input terminal of the differential operational amplifier (i.e., the inverting input terminal of the feedback loop differential operational amplifier in fig. 4) and then connected to the output terminal of the voltage division adjusting module 200 in the remote compensation circuit of the switching power supply, and the second end of the resistor R17 is further connected to the output voltage sampling terminal of the target switching power supply through the resistor R13 and the resistor R9; and the non-inverting input end of the differential operational amplifier is connected with the reference voltage, the positive power supply end is used for inputting the working voltage, the negative power supply end is grounded, and the output end is connected with the target switch power supply.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A switching power supply remote compensation circuit, comprising: the sampling signal conversion module and the partial pressure adjusting module;
the sampling signal conversion module is connected with the output voltage sampling end of a target switch power supply at a first input end, is connected with the positive end of the remote correction point of the target switch power supply at a second input end, is connected with the negative end of the remote correction point of the target switch power supply at a third input end, is connected with the first input end of the partial pressure regulating module at a first output end, and is connected with the second input end of the partial pressure regulating module at a second output end; the sampling signal conversion module is used for performing voltage signal conversion on the output voltage sampling signal of the target switching power supply and the voltage signal of the remote correction point to reduce common-mode voltage interference;
the positive power supply end of the voltage division adjusting module is used for inputting a preset power supply, the negative power supply end of the voltage division adjusting module is grounded, and the output end of the voltage division adjusting module is connected with the target switch power supply through the voltage feedback adjusting module; the voltage division adjusting module is used for carrying out differential amplification on the converted voltage signal and carrying out voltage division adjustment on the voltage feedback adjusting module by utilizing the voltage signal subjected to differential amplification so as to correct the output voltage of the target switching power supply.
2. The switching power supply remote compensation circuit according to claim 1, wherein the voltage division adjusting module comprises a differential amplifying unit and a voltage division adjusting unit;
the differential amplification unit has a first input end serving as a first input end of the partial pressure regulation module, a second input end serving as a second input end of the partial pressure regulation module, a positive power supply end serving as a positive power supply end of the partial pressure regulation module, a negative power supply end serving as a negative power supply end of the partial pressure regulation module, and an output end connected with the input end of the partial pressure regulation unit;
and the output end of the partial pressure adjusting unit is used as the output end of the partial pressure adjusting module.
3. The switching power supply far-end compensation circuit according to claim 2, wherein the differential amplification unit comprises: the circuit comprises a resistor R11, a resistor R15, a resistor R18, a capacitor C8 and a differential operational amplifier U5;
the first end of the resistor R11 is used as the first input end of the differential amplification unit, and the second end of the resistor R11 is connected with the non-inverting input end of the differential operational amplifier U5;
the resistor R15 has a first end serving as a second input end of the differential amplification unit, and a second end respectively connected with the inverting input end of the differential operational amplifier U5, the first end of the resistor R18 and the first end of the capacitor C8;
in the differential operational amplifier U5, a positive power supply terminal is used as a positive power supply terminal of the differential amplification unit, a negative power supply terminal is used as a negative power supply terminal of the differential amplification unit, and an output terminal is connected to the second terminal of the resistor R18 and the second terminal of the capacitor C8 and then is used as an output terminal of the differential amplification unit.
4. The switching power supply remote compensation circuit according to claim 2, wherein the voltage division adjusting unit comprises: a voltage dividing resistor R10;
the first end of the voltage division resistor R10 is used as the first end of the voltage division adjusting unit, and the second end is used as the second end of the voltage division adjusting unit.
5. The switching power supply remote compensation circuit according to any one of claims 2-4, wherein the sampling signal conversion module comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a triode N1, a triode N2, a capacitor C1, a capacitor C2, a voltage regulator tube U1 and a voltage regulator tube U2;
a first end of the resistor R1 is connected to a first end of the resistor R3 and then serves as a first input end of the sampling signal conversion module, and a second end of the resistor R1 is connected to an emitter of the triode N1;
the second end of the resistor R3 is respectively connected with the base electrode of the triode N1 and the negative electrode of the voltage regulator tube U2;
a collector of the triode N1 is connected to the first end of the resistor R5 and the first end of the capacitor C1, respectively, and then serves as a second output end of the sampling signal conversion module;
the anode of the voltage regulator tube U2 is connected with the second end of the resistor R5, the second end of the capacitor C1, the second end of the resistor R6 and the second end of the capacitor C2 and then grounded;
the first end of the resistor R2 is connected with the first end of the resistor R4 and then serves as the second input end of the sampling signal conversion module, and the second end of the resistor R2 is connected with the emitter of the triode N2;
the second end of the resistor R4 is respectively connected with the base electrode of the triode N2 and the negative electrode of the voltage regulator tube U1;
a collector of the triode N2 is connected to the first end of the resistor R6 and the first end of the capacitor C2, respectively, and then serves as a first output end of the sampling signal conversion module;
and the anode of the voltage regulator tube U1 is used as a third input end of the sampling signal conversion module.
6. The far-end compensation circuit of claim 5, wherein the transistor N1 and the transistor N2 are both P-type transistors, and the transistor N1 and the transistor N2 are absolutely symmetrical.
7. The switching power supply remote compensation circuit of claim 5, wherein the sampled signal conversion module further comprises a third output terminal;
the voltage division adjusting module further comprises a switch unit;
and the first end of the switch unit is connected with the output end of the differential amplification unit, the second end of the switch unit is connected with the input end of the partial pressure regulation unit, the third end of the switch unit is connected with the third output end of the sampling signal conversion module, and the fourth end of the switch unit is grounded.
8. The switching power supply remote compensation circuit according to claim 7, wherein a second terminal of the resistor R4 is connected to a base of the transistor N2 and a negative electrode of the regulator U1, respectively, and then serves as a third output terminal of the sampling signal conversion module;
the switching unit includes: a switch tube N3, a resistor R12, a resistor R19 and a voltage regulator tube Z1;
the source electrode of the switch tube N3 is used as the first end of the switch unit, the drain electrode is used as the second end of the switch unit, and the grid electrode is respectively connected with the first end of the resistor R12, the first end of the resistor R19 and the negative electrode of the voltage regulator tube Z1;
the resistor R12 has a second terminal as a third terminal of the switch unit;
and the second end of the resistor R19 is connected with the anode of the voltage regulator tube Z1 and then serves as the fourth end of the switch unit.
9. A switching power supply comprising a switching power supply remote compensation circuit according to any one of claims 1 to 8.
10. The switching power supply according to claim 9, further comprising: a voltage feedback regulation module;
the voltage feedback adjustment module includes: a resistor R17 and a differential operational amplifier;
the first end of the resistor R17 is grounded, and the second end of the resistor R17 is connected with the inverting input end of the differential operational amplifier and then connected with the output end of a voltage division adjusting module in the switch power supply far-end compensation circuit;
the non-inverting input end of the differential operational amplifier is connected with reference voltage, the positive power supply end is used for inputting working voltage, the negative power supply end is grounded, and the output end of the differential operational amplifier is connected with the target switch power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111131537.8A CN113852274A (en) | 2021-09-26 | 2021-09-26 | Switching power supply far-end compensation circuit and switching power supply |
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| CN202111131537.8A CN113852274A (en) | 2021-09-26 | 2021-09-26 | Switching power supply far-end compensation circuit and switching power supply |
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| CN113852274A true CN113852274A (en) | 2021-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117118192A (en) * | 2023-04-28 | 2023-11-24 | 荣耀终端有限公司 | Multi-stage voltage output circuit and power supply device |
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