CN116054564A - Power supply circuit - Google Patents

Power supply circuit Download PDF

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Publication number
CN116054564A
CN116054564A CN202211455068.XA CN202211455068A CN116054564A CN 116054564 A CN116054564 A CN 116054564A CN 202211455068 A CN202211455068 A CN 202211455068A CN 116054564 A CN116054564 A CN 116054564A
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China
Prior art keywords
operational amplifier
power supply
circuit
voltage
unit
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CN202211455068.XA
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Chinese (zh)
Inventor
沐林
陆跟成
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Suzhou HYC Technology Co Ltd
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Suzhou HYC Technology Co Ltd
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Priority to CN202211455068.XA priority Critical patent/CN116054564A/en
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

The present application relates to a power supply circuit. The power supply circuit includes: a circuit input and a circuit output; an external power supply input comprising a positive power supply input and a negative power supply input; the operational amplifier module comprises an operational amplifier input end, an operational amplifier output end, an operational amplifier positive power end and an operational amplifier negative power end, wherein the operational amplifier input end is connected with the circuit input end, the operational amplifier output end is connected with the circuit output end, the operational amplifier positive power end is connected with the positive power input end, and the operational amplifier negative power end is connected with the negative power input end; the diffusion module is connected with the operational amplifier module and used for diffusing the voltage output by the operational amplifier module, and the diffusion module comprises a voltage stabilizing unit, and the voltage stabilizing unit is connected with the operational amplifier positive power supply end and the operational amplifier negative power supply end. The operational amplifier module of the power supply circuit has the characteristics of high voltage swing rate and high current, and meanwhile, the swing amplitude of the output voltage of the power supply circuit can be enlarged.

Description

Power supply circuit
Technical Field
The invention relates to the technical field of voltage gain, in particular to a power supply circuit.
Background
In the process of manufacturing and testing the display module, various circuits such as a time sequence control circuit, a scanning driving circuit, a data driving circuit and the like are needed. The display modules have high requirements on the quality of the power supply, and different sizes of display modules have different requirements on the range of the power supply voltage, the slew rate and the driving current.
However, the existing power supply circuit cannot meet the swing range of the driving voltage of the display module.
Disclosure of Invention
Based on this, it is necessary to provide a power supply circuit that can satisfy the swing range of the driving voltage of the display module.
A power supply circuit, comprising:
a circuit input and a circuit output;
an external power supply input comprising a positive power supply input and a negative power supply input;
the operational amplifier module comprises an operational amplifier input end, an operational amplifier output end, an operational amplifier positive power end and an operational amplifier negative power end, wherein the operational amplifier input end is connected with the circuit input end, the operational amplifier output end is connected with the circuit output end, the operational amplifier positive power end is connected with the positive power input end, and the operational amplifier negative power end is connected with the negative power input end;
the diffusion module is connected with the operational amplifier module and used for diffusing the voltage output by the operational amplifier module, and the diffusion module comprises a voltage stabilizing unit, and the voltage stabilizing unit is connected with the operational amplifier positive power supply end and the operational amplifier negative power supply end.
In one embodiment, the voltage stabilizing unit includes:
one end of the first voltage stabilizer unit is connected with the positive power supply end of the operational amplifier, and the other end of the first voltage stabilizer unit is connected with the output end of the operational amplifier;
and one end of the second voltage stabilizing subunit is connected with the operational amplifier negative power supply end, and the other end of the second voltage stabilizing subunit is connected with the operational amplifier output end.
In one embodiment, the diffusion module includes:
the positive diffusion unit is connected with the operational amplifier positive power supply end and the first voltage stabilizing subunit;
and the negative diffusion unit is connected with the operational amplifier negative power supply end and the second voltage stabilizing subunit.
In one embodiment, the positive diffuser unit includes:
the source electrode and the drain electrode of the transistor Q1 are respectively connected with the positive power supply end and the positive power supply input end of the operational amplifier;
a resistor R2 connected with the drain electrode of the transistor Q1 and the first voltage stabilizing subunit;
and the resistor R3 is connected with the grid electrode of the transistor Q1 and the first voltage stabilizing subunit.
In one embodiment, the negative diffusion unit includes:
the source electrode and the drain electrode of the transistor Q2 are respectively connected with the negative power supply end of the operational amplifier and the negative power supply input end;
a resistor R9 connected with the drain electrode of the transistor Q2 and the second voltage stabilizing subunit;
and a resistor R8 connected with the grid electrode of the transistor Q2 and the second voltage stabilizing subunit.
In one embodiment, the power supply circuit further comprises:
and the two ends of the current-limiting resistor are respectively connected with the operational amplifier output end and the circuit output end.
In one embodiment, the power supply circuit further comprises:
and the short-circuit protection module is connected with the circuit output end and the operational amplifier module and is used for carrying out short-circuit protection on the operational amplifier module.
In one embodiment, the short-circuit protection module includes:
the diode D1 is connected with the operational amplifier output end and the operational amplifier positive power end;
and the diode D3 is connected with the operational amplifier output end and the operational amplifier negative power end.
In one embodiment, the op-amp input terminal includes: the first input end is connected with the circuit input end, and the second input end is connected with the grounding end of the power supply circuit;
the power supply circuit further comprises a feedback module, the feedback module comprises a first feedback unit and a second feedback unit, the first feedback unit is connected with the circuit output end and the circuit input end, and the second feedback unit is connected with the circuit output end and the grounding end.
In one embodiment, the first feedback unit includes a first resistor unit and a second resistor unit, the first resistor unit is connected to the circuit output end and the first input end, and the second resistor unit is connected to the first input end and the circuit input end;
the second feedback unit comprises a third resistor unit and a fourth resistor unit, wherein the third resistor unit is connected with the circuit output end and the second input end, and the fourth resistor unit is connected with the second input end and the circuit grounding end.
According to the power supply circuit, the voltage stabilizing unit in the diffusion module stabilizes the working voltage of the operational amplifier module, so that the operational amplifier module can work normally, and the diffusion module is not affected by the operational amplifier power supply voltage when the voltage swing is enlarged. When the power supply circuit works, the external power supply input end supplies power to the operational amplifier, and the diffusion module diffuses the output of the operational amplifier. The diffusion module is not influenced by the power supply voltage of the operational amplifier, so that the swing amplitude of the output voltage of the power supply circuit can be increased. Therefore, the operational amplifier module of the power circuit of the embodiment has the characteristics of high voltage swing rate and high current, and can expand the swing of the output voltage of the power circuit.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a block diagram of a power circuit according to an embodiment;
FIG. 2 is a block diagram of a power circuit according to another embodiment;
fig. 3 is a circuit schematic of a power supply circuit according to an embodiment.
Reference numerals illustrate: 10-external power supply input end, 11-positive power supply input end, 12-negative power supply input end, 20-circuit input end, 30-operational amplifier module, 40-circuit output end, 50-diffusion module, 51-voltage stabilizing unit, 511-first voltage stabilizing subunit, 512-second voltage stabilizing subunit, 52-positive diffusion unit, 53-negative diffusion unit, 60-short circuit protection module, 70-feedback module, 71-first feedback unit and 72-second feedback unit.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
In one embodiment, referring to fig. 1, a power circuit is provided, comprising: circuit input 20, circuit output 40, external power input 10, op-amp module 30, and diffuser module 50.
The circuit input 20 may receive a voltage signal from the preamble structure and pass it to the op-amp module 30 of the power circuit. For example, in performing display module testing, a Field Programmable Gate Array (FPGA) may control a high-speed digital-to-analog conversion (DAC) circuit to output voltage to circuit input 20.
The circuit output terminal 40 is used as an output terminal of the whole power supply circuit, and can output various required power supply voltages to transmit the voltages to subsequent circuit structures.
The external power supply input 10 comprises a positive power supply input 11 and a negative power supply input 12. As an example, positive power supply input 11 may provide a positive 48V voltage to the power supply circuit and negative power supply input 12 may provide a negative 48V voltage to the power supply circuit.
The operational amplifier module 30 includes an operational amplifier input terminal, an operational amplifier output terminal, an operational amplifier positive power terminal, and an operational amplifier negative power terminal. The op-amp input is coupled to the circuit input 20 to receive a voltage signal from the circuit input 20. The operational amplifier output terminal is connected to the circuit output terminal 40, and outputs the voltage signal amplified by the operational amplifier module 30 to the circuit output terminal 40, thereby providing an electrical signal for a subsequent circuit structure. The positive power supply end of the operational amplifier is connected with the positive power supply input end 11, can receive a voltage signal from the positive power supply input end 11, and the negative power supply end of the operational amplifier is connected with the negative power supply input end 12, and can receive a voltage signal from the negative power supply input end 12.
The diffusion module 50 is connected to the operational amplifier module 30, and is configured to diffuse the voltage output by the operational amplifier module 30, and further output the diffused voltage to the circuit output terminal 40.
The diffusion module 50 includes a voltage stabilizing unit 51, where the voltage stabilizing unit 51 is connected to the positive power supply end of the op amp and the negative power supply end of the op amp to form a closed loop, and the voltage stabilizing unit 51 can make the voltage difference between the positive power supply end of the op amp and the negative power supply end of the op amp stable within a fixed range, so that the op amp module 30 works normally. As an example, it may be stable within 32V.
In the case of diffusion, the voltage of the external power input terminal 10 is not affected by the power supply voltage of the op-amp (the difference between the voltages of the positive power supply terminal and the negative power supply terminal of the op-amp), and a larger voltage is output through the op-amp module 30.
In this embodiment, the voltage stabilizing unit 51 in the diffusion module 50 stabilizes the working voltage of the operational amplifier module 30, so that the operational amplifier module 30 can work normally, and the diffusion module 50 is not affected by the operational amplifier supply voltage when the voltage swing is enlarged. When the power supply circuit works, the external power supply input end 10 supplies power to the operational amplifier, and the diffusion module 50 diffuses the output of the operational amplifier. The diffusion module 50 diffuses the voltage not affected by the operational amplifier supply voltage, so that the swing of the output voltage of the power circuit can be increased. Therefore, the operational amplifier module 30 of the power circuit of the present embodiment has the characteristics of high slew rate and high current, and can expand the swing of the output voltage of the power circuit.
In one embodiment, referring to fig. 2, the voltage stabilizing unit 51 includes: the first voltage stabilizing subunit 511 and the second voltage stabilizing subunit 512.
The first voltage stabilizing subunit 511 is connected to the positive power supply terminal of the op-amp and the output terminal of the op-amp. Specifically, the first voltage stabilizing subunit 511 may include a voltage stabilizing tube.
The second voltage stabilizer unit 512 is connected to the negative power supply terminal of the op-amp and the output terminal of the op-amp. Specifically, the second voltage regulator subunit 512 may include a voltage regulator tube.
When the voltage at two ends of the voltage stabilizing tube is below the voltage stabilizing value, the voltage stabilizing tube is cut off; when the reverse voltage at the two ends of the voltage stabilizing tube reaches the voltage stabilizing value, the reverse current suddenly increases, and the voltage stabilizing diode breaks down, so that the reverse voltage at the two ends of the voltage stabilizing diode can be basically kept unchanged even if the reverse current changes in a large range.
The first voltage stabilizer unit 511 and the second voltage stabilizer unit 512 cooperate to stabilize the voltage difference between the positive power supply terminal of the clamp op-amp and the negative power supply terminal of the op-amp within a fixed range.
Specifically, for example, when the voltage of the positive power supply terminal of the op-amp is 42V, the first voltage stabilizer unit 511 and the second voltage stabilizer unit 512 cooperate to clamp the voltage difference between the positive power supply terminal of the op-amp and the negative power supply terminal of the op-amp within 32V.
In this embodiment, the first voltage stabilizing subunit 511 and the second voltage stabilizing subunit 512 stabilize the working voltage of the op-amp, so that the voltage difference between the positive power supply terminal and the negative power supply terminal of the op-amp is within a preset range, and the op-amp works normally.
In one embodiment, the diffuser module 50 includes: a positive diffuser 52 and a negative diffuser 53.
One end of the positive diffusion unit 52 is connected to the positive power supply end of the operational amplifier, and the other end is connected to the first voltage stabilizing subunit 511.
As an example, the positive diffusion unit 52 may include a transistor Q1, a resistor R2, and a resistor R3. The source and drain of the transistor Q1 are connected to the positive power supply terminal of the op amp and the positive power supply input terminal 11, respectively. Specifically, a source of the transistor Q1 is connected to the positive power supply terminal of the op amp, and a drain of the transistor Q1 is connected to the positive power supply input terminal 11. The resistor R2 is connected to the drain of the transistor Q1 and the first voltage stabilizing subunit 511. The resistor R3 is connected to the gate of the transistor Q1 and the first voltage stabilizing subunit 511.
One end of the negative diffusion unit 53 is connected to the negative power supply end of the op amp, and the other end is connected to the second voltage stabilizing subunit 512.
As an example, the negative diffusion unit 53 may include a transistor Q2, a resistor R9, and a resistor R8. The source and the drain of the transistor Q2 are respectively connected to the negative power supply end of the op amp and the negative power supply input end 12, specifically, the source of the transistor Q2 is connected to the negative power supply end of the op amp, and the drain of the transistor Q2 is connected to the negative power supply input end 12. Resistor R9 is connected to the drain of transistor Q2 and to the second voltage regulator subunit 512. Resistor R8 is connected to the gate of transistor Q2 and to the second voltage regulator unit 512.
When the operational amplifier module 30 is operating normally, the voltage vs+ at the positive power supply end of the operational amplifier is equal to the voltage U at the output end 40 of the circuit 0 Transistor Q1 voltage U GS(Q1) Voltage U of voltage stabilizing tube D2 D2 Resistor R3 voltage U R3 Sum, i.e. vs+=u O +U D2 +U GS(Q1) +U R3 . The voltage VS-at the negative power supply terminal of the operational amplifier is equal to the voltage U at the output terminal 40 of the circuit O Subtracting the transistor Q2 voltage U GS(Q2) Voltage U of voltage stabilizing tube D4 D4 Resistor R8 voltage U R8 Is the difference of (VS- =u) O -U D4 -U GS(Q2) -U R8 . The voltage of the operational amplifier positive power supply end is subtracted from the voltage of the operational amplifier negative power supply end, so that the voltage difference between the operational amplifier positive power supply end and the operational amplifier negative power supply end can be obtained as follows:
(VS+)-(VS-)＝(U O +U D2 +U GS(Q1) +U R3 )–(U O -U D4 -U GS(Q2) -U R8 )＝U D2 +U D4 +U GS(Q1) +U GS(Q2) +U R3 +U R8 wherein the resistance values of the resistor R3 and the resistor R8 can be set to be very small, and the current flowing on the resistor R3 and the resistor R8 is in the milliamp level at the moment, so the voltage U of the resistor R3 and the resistor R8 R3 、U R8 Can be ignored. At this time, the voltage difference between the positive power supply terminal and the negative power supply terminal is equal to the sum of the voltages of the voltage stabilizing tube D2 and the voltage stabilizing tube D4 and the voltages of the transistors Q1 and Q2, i.e., (vs+) - (VS-) =u D2 +U D4 +U GS(Q1) +U GS(Q2) . The voltage at the two ends of the voltage stabilizing tube D2 and the voltage stabilizing tube D4 can be controlled in a stable range. For example, if the clamp voltages of the regulator tube D2 and the regulator tube D4 are 15V, U D2 +U D4 Can not exceed 30V, i.e. can be controlled within 30V. At the same time, U can be controlled GS(Q1) +U GS(Q2) <At this time, the voltage difference between the positive power supply terminal and the negative power supply terminal of the op amp can be controlled to be smaller than 32V, i.e. the bipolar power supply voltage range of the op amp module 30 is controlled to be smaller than 32V.
When the swing is calculated in the open loop state, the transistors Q1, Q2 and the transistors in the op-amp module 30 are all in the saturated on state. At this time, the voltage across the regulator tube D2 and the regulator tube D4 is approximately 0V. When the transistor Q1 is in the saturated-on state, the voltage vs+ at the positive power supply terminal of the op-amp is approximately equal to the voltage at the positive power supply input terminal 11. The circuit output terminal 40 voltage U O The voltage of transistor Q1 is subtracted from the voltage VCC_POS at positive power supply input 11U GS(Q1) Voltage U of voltage stabilizing tube D2 D2 U, i.e. U O ＝VCC_POS-U GS(Q1) -U D2 . At the same time U D2 Approximately equal to 0V, thus U O ＝VCC_POS-U GS(Q1) 。U GS(Q1) The saturated on voltage of (2V) is usually small, and the voltage at the output terminal 40 of the circuit is U O Up to 46V is possible.
When the transistor Q2 is in the saturated-on state, the voltage VS-at the negative supply terminal of the op-amp is approximately equal to the voltage at the negative supply input terminal 12. The circuit output terminal 40 voltage U O Voltage U equal to voltage vcc_neg of negative power supply input 12 minus transistor Q2 GS(Q2) Voltage U of voltage stabilizing tube D4 D4 U, i.e. U O ＝VCC_NEG+U GS(Q2) +U D4 . At the same time U D4 Approximately equal to 0V, therefore U O ＝VCC_NEG+U GS(Q2) 。U GS(Q2) Typically less, for example 2V, the voltage at the output 40 of the circuit may reach-46V.
Therefore, at this time U O Can reach-46V to 46V. In actual operation, when the control transistor is operating in the on-line state, the voltage U at the circuit output terminal 40 O The swing of (2) may be controlled in the range of-46V to 46V, for example the swing may be-40V to 40V. At this time, the voltage U at the circuit output terminal 40 O The swing can be effectively enlarged.
In one embodiment, the power supply circuit further comprises: a current limiting resistor.
Both ends of the current limiting resistor are respectively connected with the operational amplifier output end and the circuit output end 40. The current limiting resistor may include a resistor R5 or a plurality of resistors connected in series, which is not limited herein, and specifically may be selected according to practical situations.
In this embodiment, when the load in the subsequent circuit structure connected to the circuit output terminal 40 is a capacitor, a large current may be input to the current power supply circuit at the moment of capacitor charging. At this time, the current limiting resistor is added in the power circuit, so that the capacity loading capacity of the power circuit can be improved, and the damage of the subsequent circuit structure caused by high current to the power circuit can be avoided.
In one embodiment, the power circuit further includes a short circuit protection module 60.
The short-circuit protection module 60 has one end connected to the circuit output terminal 40 and the other end connected to the op-amp module 30. The short-circuit protection module 60 may perform short-circuit protection on the op-amp module 30.
The output end of the circuit can be connected with other circuits, the other circuits can affect the power supply circuit, so that the voltage of the output end of the operational amplifier is larger than the voltage of the positive power supply end of the operational amplifier module 30 or smaller than the voltage of the negative power supply end of the operational amplifier, at the moment, the short-circuit protection module 60 is added between the output end 40 of the circuit and the operational amplifier module 30, and the voltage relation can be reversed to finish the protection of the operational amplifier module 30.
As an example, the short protection module 60 may include a diode D1 and a diode D3. The diode D1 is connected with the operational amplifier output end and the operational amplifier positive power supply end, and the diode D3 is connected with the operational amplifier output end and the operational amplifier negative power supply end. When the voltage of the output end of the operational amplifier is larger than that of the positive power end of the operational amplifier, the diode D1 is conducted in the forward direction, and therefore the positive power end of the operational amplifier is protected. When the voltage of the output end of the operational amplifier is smaller than that of the negative power end of the operational amplifier, the diode D3 is conducted positively, and therefore the negative power end of the operational amplifier is protected. Specifically, the diode D1 and the diode D3 may each employ a schottky diode.
In one embodiment, the op-amp input comprises: a first input terminal and a second input terminal.
Wherein the first input is connected to the circuit input 20 and the second input is connected to the ground of the power circuit.
Specifically, the first input terminal may be an inverting input terminal of the op-amp, and the second input terminal may be a non-inverting input terminal of the op-amp.
In this embodiment, referring to fig. 2 and 3, the power circuit further includes: a feedback module 70.
The feedback module 70 includes a first feedback unit 71 and a second feedback unit 72. The first feedback unit 71 is connected to the circuit output terminal 40 and the circuit input terminal 20, and samples the signal of the circuit output terminal 40 and feeds back the signal to the circuit input terminal 20. The second feedback unit 72 connects the circuit output terminal 40 with the ground terminal of the power circuit, samples the signal of the circuit output terminal 40, and feeds back the sampled signal to the ground terminal.
As an example, the first feedback unit 71 includes a first resistance unit and a second resistance unit. The first resistor unit is connected to the circuit output 40 and to the first input. The first resistor unit may include one resistor or a plurality of resistors connected in series, which is not limited herein. At this time, the voltage at the first input terminal can meet the requirement of the op-amp module 30 through the first feedback unit 71.
As an example, the first resistance unit may include a resistance R1 and a resistance R81. The second resistor unit is connected to the circuit input 20 and to the first input. The second resistor unit may include one resistor or a plurality of resistors, which is not limited herein. Specifically, the second resistance unit may include a resistance R4.
The second feedback unit 72 includes a third resistance unit and a fourth unit. The third resistor unit is connected to the circuit output 40 and the second input. The third resistor unit may include one resistor or a plurality of resistors, which is not limited herein. At this time, the voltage at the second input terminal can meet the requirement of the operational amplifier module 30 through the first feedback unit 71.
As an example, the third resistance unit may include a resistance R10. The fourth resistor unit is connected with the circuit grounding end and the second input end. The fourth resistor unit may include one resistor or a plurality of resistors connected in series, which is not limited herein. Specifically, the fourth resistance unit may include a resistance R6.
The feedback module 70 selects a resistor with proper resistance value to calculate the gain of the power circuit as
Figure BDA0003953198420000111
In this embodiment, the application feedback module 70 may correlate the input signal of the operational amplifier module 30 with the output signal, so as to avoid that the signal voltage at the input end is not within the allowable input range of the operational amplifier.
In addition, the power supply circuit further includes a capacitor C2. The capacitor C2 serves as a decoupling capacitor, and can improve the common mode rejection ratio and the power rejection ratio of the power supply circuit in a high frequency state.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. A power supply circuit, comprising:
a circuit input and a circuit output;
an external power supply input comprising a positive power supply input and a negative power supply input;
the operational amplifier module comprises an operational amplifier input end, an operational amplifier output end, an operational amplifier positive power end and an operational amplifier negative power end, wherein the operational amplifier input end is connected with the circuit input end, the operational amplifier output end is connected with the circuit output end, the operational amplifier positive power end is connected with the positive power input end, and the operational amplifier negative power end is connected with the negative power input end;
the diffusion module is connected with the operational amplifier module and used for diffusing the voltage output by the operational amplifier module, and the diffusion module comprises a voltage stabilizing unit, and the voltage stabilizing unit is connected with the operational amplifier positive power supply end and the operational amplifier negative power supply end.
2. The power supply circuit according to claim 1, wherein the voltage stabilizing unit includes:
one end of the first voltage stabilizer unit is connected with the positive power supply end of the operational amplifier, and the other end of the first voltage stabilizer unit is connected with the output end of the operational amplifier;
and one end of the second voltage stabilizing subunit is connected with the operational amplifier negative power supply end, and the other end of the second voltage stabilizing subunit is connected with the operational amplifier output end.
3. The power circuit of claim 2, wherein the diffusion module comprises:
the positive diffusion unit is connected with the operational amplifier positive power supply end and the first voltage stabilizing subunit;
and the negative diffusion unit is connected with the operational amplifier negative power supply end and the second voltage stabilizing subunit.
4. A power supply circuit according to claim 3, wherein the positive diffuser unit comprises:
the source electrode and the drain electrode of the transistor Q1 are respectively connected with the positive power supply end and the positive power supply input end of the operational amplifier;
a resistor R2 connected with the drain electrode of the transistor Q1 and the first voltage stabilizing subunit;
and the resistor R3 is connected with the grid electrode of the transistor Q1 and the first voltage stabilizing subunit.
5. A power supply circuit according to claim 3, wherein the negative diffusion unit comprises:
the source electrode and the drain electrode of the transistor Q2 are respectively connected with the negative power supply end of the operational amplifier and the negative power supply input end;
a resistor R9 connected with the drain electrode of the transistor Q2 and the second voltage stabilizing subunit;
and a resistor R8 connected with the grid electrode of the transistor Q2 and the second voltage stabilizing subunit.
6. The power supply circuit of claim 1, wherein the power supply circuit further comprises:
and the two ends of the current-limiting resistor are respectively connected with the operational amplifier output end and the circuit output end.
7. The power supply circuit of claim 1, wherein the power supply circuit further comprises:
and the short-circuit protection module is connected with the circuit output end and the operational amplifier module and is used for carrying out short-circuit protection on the operational amplifier module.
8. The power supply circuit of claim 7, wherein the short-circuit protection module comprises:
the diode D1 is connected with the operational amplifier output end and the operational amplifier positive power end;
and the diode D3 is connected with the operational amplifier output end and the operational amplifier negative power end.
9. The power supply circuit of claim 1, wherein the power supply circuit comprises a power supply circuit,
the operational amplifier input end comprises: the first input end is connected with the circuit input end, and the second input end is connected with the grounding end of the power supply circuit;
the power supply circuit further comprises a feedback module, the feedback module comprises a first feedback unit and a second feedback unit, the first feedback unit is connected with the circuit output end and the circuit input end, and the second feedback unit is connected with the circuit output end and the grounding end.
10. The power circuit of claim 9, wherein the power circuit comprises a power supply circuit,
the first feedback unit comprises a first resistor unit and a second resistor unit, the first resistor unit is connected with the circuit output end and the first input end, and the second resistor unit is connected with the first input end and the circuit input end;
the second feedback unit comprises a third resistor unit and a fourth resistor unit, wherein the third resistor unit is connected with the circuit output end and the second input end, and the fourth resistor unit is connected with the second input end and the circuit grounding end.
CN202211455068.XA 2022-11-21 2022-11-21 Power supply circuit Pending CN116054564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211455068.XA CN116054564A (en) 2022-11-21 2022-11-21 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211455068.XA CN116054564A (en) 2022-11-21 2022-11-21 Power supply circuit

Publications (1)

Publication Number Publication Date
CN116054564A true CN116054564A (en) 2023-05-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211455068.XA Pending CN116054564A (en) 2022-11-21 2022-11-21 Power supply circuit

Country Status (1)

Country Link
CN (1) CN116054564A (en)

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