CN116365838A - Operational amplifier adjusting method, operational amplifier adjusting circuit and switching circuit using operational amplifier adjusting circuit - Google Patents

Operational amplifier adjusting method, operational amplifier adjusting circuit and switching circuit using operational amplifier adjusting circuit Download PDF

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Publication number
CN116365838A
CN116365838A CN202211676408.1A CN202211676408A CN116365838A CN 116365838 A CN116365838 A CN 116365838A CN 202211676408 A CN202211676408 A CN 202211676408A CN 116365838 A CN116365838 A CN 116365838A
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operational amplifier
adjusting
circuit
signal
load
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程扬
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Joulwatt Technology Co Ltd
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Joulwatt Technology Co Ltd
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Priority to CN202211676408.1A priority Critical patent/CN116365838A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/30—Modifications for providing a predetermined threshold before switching
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

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

Abstract

The invention discloses an operational amplifier adjusting method, an operational amplifier adjusting circuit and a switching circuit applying the operational amplifier adjusting method, wherein the operational amplifier is applied to the switching circuit, and the operational amplifier carries out operational amplification on a reference signal and an output feedback signal of the switching circuit to obtain an operational amplification signal for controlling the switching state of the switching circuit; and detecting the load of the switching circuit, and setting an adjusting device at the input end of the operational amplifier or/and the output end of the operational amplifier when the load is reduced, wherein the adjusting device is used for adjusting the operational amplification signal so as to inhibit the change of the operational amplification signal. When the load of the switching circuit is reduced, the operational amplification signal can be quickly and stably recovered, and the output characteristic of the switching circuit is better.

Description

Operational amplifier adjusting method, operational amplifier adjusting circuit and switching circuit using operational amplifier adjusting circuit
Technical Field
The invention relates to the field of power electronics, in particular to an operational amplifier adjusting method and an operational amplifier adjusting circuit applied to a switching power supply circuit and a switching circuit applying the operational amplifier adjusting method and the operational amplifier adjusting circuit.
Background
In a switching circuit, an operational amplifier is often required to perform operational amplification on an output feedback voltage of the switching circuit and a reference voltage to obtain an adjustment signal for controlling a switching state; as shown in fig. 1, when the output of the switching circuit is unloaded or from heavy load to light load, since the inductor current cannot be reduced rapidly, an output overshoot is formed at the output end of the switching circuit, so that the output of the op-amp has an excessively low value, and after the overshoot is over, the output of the op-amp is difficult to recover to a corresponding new target value in a short time, and particularly when the load is switched frequently, the dynamic response of the next loading in a short time is affected.
Disclosure of Invention
The invention aims to provide an operational amplifier adjusting method and an operational amplifier adjusting circuit with good output performance of a switching circuit and the switching circuit using the operational amplifier adjusting method and the operational amplifier adjusting circuit, which are used for solving the problem that the output performance of the switching circuit is affected because an operational amplifier output signal cannot be recovered quickly when a load is reduced in the prior art.
In order to achieve the above object, the present invention provides a method for adjusting an operational amplifier, where the operational amplifier is applied to a switching circuit, and the operational amplifier performs operational amplification on a reference signal and an output feedback signal of the switching circuit to obtain an operational amplification signal, so as to control a switching state of the switching circuit;
and detecting the load of the switching circuit, and setting an adjusting device at the input end of the operational amplifier or/and the output end of the operational amplifier when the load is reduced, wherein the adjusting device is used for adjusting the operational amplification signal so as to inhibit the change of the operational amplification signal.
Optionally, when the reduction amount of the load is greater than a first threshold, an adjusting device is arranged at the input end of the operational amplifier or/and the output end of the operational amplifier, and is used for adjusting the operational amplification signal so as to inhibit the change of the operational amplification signal.
Optionally, the adjusting means is for adjusting the operational amplifier signal to be unchanged for a period of time when the load decreases.
Optionally, when the adjusting device is arranged at the output end of the operational amplifier, the adjusting device is an impedance circuit.
Optionally, the impedance circuit is an adjusting resistor, and when the load decreases, the adjusting resistor is connected to the output end of the operational amplifier.
Optionally, the impedance circuit is an adjusting tube, and when the load is reduced, the on-resistance of the adjusting tube is controlled to be increased or the adjusting tube is controlled to be turned off.
Optionally, the adjusting device comprises an adder or a subtracter, and the adder or the subtracter is used for superimposing the adjustment quantity on the reference signal, or/and subtracting the adjustment quantity on the output feedback signal, or/and superimposing the adjustment quantity on the operational amplifier output signal.
Optionally, when the input signal or/and the output signal of the op-amp are adjusted, the adjustment amount is a fixed value; alternatively, the absolute magnitude of the adjustment is positively correlated with the load reduction; alternatively, the absolute value of the adjustment quantity is positively correlated with the output voltage of the switching circuit.
Optionally, the operational amplifier is adjusted to have a duration that is a fixed time or is positively correlated with the amount of reduction in the load.
Optionally, the change in load is detected by detecting a change in the output signal of the switching circuit.
Optionally, the output signal is an output voltage or an output current of the switching circuit.
Optionally, when it is detected that the output voltage or the rate of change of the output current over time reaches a respective threshold value, the load is characterized as decreasing to the corresponding threshold value.
Alternatively, the change in load is detected by detecting a change in an electrical signal of a switching circuit node.
The invention also provides an operational amplifier adjusting method, the operational amplifier is applied to the switch circuit, and the operational amplifier carries out operational amplification on the reference signal and the output feedback signal of the switch circuit to obtain an operational amplification signal for controlling the switch state of the switch circuit;
increasing the gain of the op-amp to suppress variations in the op-amp signal when the load decreases; the variation of the operational amplifier gain is a fixed value, or is positively correlated with the reduction of the load, or is positively correlated with the output voltage of the switching circuit.
The invention also provides an operational amplifier adjusting circuit, which is applied to the switch circuit, wherein the operational amplifier is used for carrying out operational amplification on the reference signal and an output feedback signal of the switch circuit to obtain an operational amplification signal, and the operational amplification signal is used for controlling the switch state of the switch circuit; the regulating circuit comprises a circuit which is connected with the power supply,
and the adjusting device is connected with the input end or/and the output end of the operational amplifier and is used for adjusting the operational amplification signal when the load of the switching circuit is reduced so as to inhibit the change of the operational amplification signal.
Optionally, when the adjusting device is arranged at the output end of the operational amplifier, the adjusting device comprises a first switch and an adjusting resistor, the first switch and the adjusting resistor are connected in parallel at the output end of the operational amplifier, and when the load is reduced, the first switch is turned off.
Optionally, when the adjusting device is arranged at the output end of the operational amplifier, the adjusting device comprises an adjusting tube, and when the load is reduced, the on-resistance of the adjusting tube is controlled to be increased, or the adjusting tube is controlled to be turned off.
Optionally, the adjusting means comprises an adder or a subtractor, and the adjusting means comprises an adder or a subtractor for superimposing the adjustment amount on the reference signal, or/and subtracting the adjustment amount on the output feedback signal, or/and superimposing the adjustment amount on the op-amp output signal.
Optionally, the adjusting device further comprises an adjusting quantity generating circuit, which is used for generating the adjusting quantity, wherein the adjusting quantity is a fixed value; alternatively, the absolute magnitude of the adjustment is positively correlated with the amount of decrease in the load; alternatively, the absolute value of the adjustment is positively correlated with the output voltage.
Optionally, the adjusting device further comprises an adjusting enabling circuit, wherein the adjusting enabling circuit adjusts the operational amplifier for a certain duration, and the adjusting enabling circuit controls the duration to be a fixed time or is positively related to the reduction of the load.
The invention also provides a switching circuit, which comprises a power tube and a controller, wherein the controller controls the switching state of the power tube, the controller comprises an operational amplifier and any one of the operational amplifier regulating circuits, the operational amplifier carries out operational amplification on a reference signal and an output feedback signal to obtain an operational amplification signal, and the regulating circuit is used for regulating the operational amplification signal when the load of the switching circuit is reduced so as to inhibit the change of the operational amplification signal.
Compared with the prior art, the technical scheme of the invention has the following advantages: when the load of the switching circuit is reduced, the invention adjusts the output signal of the operational amplifier by arranging the adjusting device at the input end or/and the output end of the operational amplifier, or/and adjusts the output signal of the operational amplifier by adjusting the gain of the operational amplifier, so as to inhibit, weaken or weaken the change of the output of the operational amplifier, and obtain the adjusted operational amplifier signal to control the switching state of the switching circuit. When the load is reduced, the operational amplification signal can be quickly recovered and stabilized, which is favorable for the dynamic response capability of the next load loading, and particularly in a switching circuit with frequent jump, the output characteristic of the switching circuit can be better.
Drawings
FIG. 1 is a waveform diagram of an output of an operational amplifier in the prior art;
FIG. 2 is a block diagram of an adjusting circuit of the present invention including at least one adjusting device;
FIG. 3 is a schematic diagram of a switching circuit employing a regulating circuit according to the present invention;
FIG. 4 is a schematic diagram of another switching circuit employing a regulating circuit according to the present invention;
FIG. 5 is a schematic diagram of another switching circuit employing a regulating circuit according to the present invention;
FIG. 6 is a schematic diagram of another switching circuit employing a regulating circuit according to the present invention;
FIG. 7 is a schematic diagram of another switching circuit employing a regulating circuit according to the present invention;
fig. 8 is a waveform diagram of the output of the switching circuit of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention.
In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present invention.
As shown in fig. 2, a schematic diagram of an operational amplifier regulating circuit is illustrated, in a switching circuit, an operational amplifier amplifies a reference signal and an output feedback signal to obtain an operational amplification signal, and the operational amplifier regulating circuit is used for regulating the operational amplifier, namely regulating the operational amplification signal, so as to inhibit, weaken or weaken the change of the operational amplification signal when the load of the switching circuit is reduced, including inhibiting the change amplitude and duration of the operational amplification signal, so that the change amplitude and duration of the operational amplification signal are small or unchanged, the change duration is short, the operational amplification signal is faster and smoother to recover to a stable value, and the change of a load can be better and quicker responded when the switching circuit is loaded next time; preferably, when the load reduction reaches a first threshold, the operational amplifier is adjusted, and when the load reduction is smaller than the first threshold, the load reduction is too small, so that the influence on the change of the output of the operational amplifier is small, and the operational amplifier can not be adjusted under the condition, so that the operational amplifier adjusting mode is simplified;
the adjusting circuit comprises at least one adjusting device, wherein the adjusting device is arranged at an input end or/and an output end of the operational amplifier, the input end of the operational amplifier comprises a non-inverting input end and an inverting input end of the operational amplifier, the adjusting device is arranged at the non-inverting input end and the inverting input end of the operational amplifier and is used for adjusting a non-inverting input signal and an inverting input signal of the operational amplifier, and the adjusting device is arranged at the output end of the operational amplifier and is used for directly adjusting the output signal of the operational amplifier; according to the invention, when the load is reduced, a plurality of adjusting devices or one adjusting device can be simultaneously arranged according to the requirement for adjusting the operational amplifier. The inventive adjusting device preferably comprises an adder or a subtracter for superimposing an adjustment quantity on the original reference signal or/and the output signal of the op-amp, or/and for subtracting the adjustment quantity on the feedback input signal, the adjustment quantity can be a fixed value; the magnitude of the adjustment quantity can be set according to the reduction quantity of the load of the switching circuit, and the adjustment quantity is positively related to the reduction quantity of the load; the regulating variable can also be set to change along with the change of the output signal, and the regulating variable changes along with the positive correlation of the output voltage; the invention can also adjust the gain G of the operational amplifier, and the gain G of the operational amplifier is reduced when the load is reduced, wherein the reduction of the gain G is a fixed value or is positively correlated with the reduction of the load;
the change of the load can be detected by detecting the change of the output signal of the switch circuit or the switch node electric signal, and the output signal comprises output voltage or output current; the adjusting of the operational amplifier has a certain duration, and the duration can be fixed time or is positively related to the reduction of the load, and the larger the load reduction is, the longer the adjusting time is; the adjusting device of the present invention may also be other types of computing devices or circuit structures for adjusting the related signals to obtain adjusted operational amplified signals.
As shown in fig. 3, a schematic diagram of a switching circuit employing an adjusting circuit according to the present invention is illustrated, where the adjusting circuit U02 has only one adjusting device, and is disposed at a non-inverting input end of the op-amp U03, and is configured to adjust a reference signal VREF input by the op-amp, to obtain an adjusted operational amplification signal, and the operational amplification signal controls a switching state of the switching circuit through a driving control circuit U04; the regulating device comprises an adder U201, a regulating quantity generating circuit U202 and an enabling circuit U203, when the output signal detecting circuit U01 detects that the change rate of the output voltage Vout along with time reaches a corresponding threshold value, the load is represented to be reduced, the enabling circuit U203 outputs an enabling signal EN to control the regulating quantity generating circuit U202 to work, the enabling time is the duration of regulating the operational amplifier, the regulating quantity generating circuit U202 generates a corresponding regulating quantity V1 according to the output voltage Vout after being enabled for fixed time or in positive correlation with the load reducing quantity, the regulating quantity V1 changes along with the output voltage, preferably in positive correlation with the output voltage, and further preferably in direct proportion; the adder U201 superimposes the adjustment amount V1 and the reference signal VREF to obtain an adjusted reference signal VREF ', and the op-amp U03 op-amp the adjusted reference signal VREF' and the output feedback signal FB to obtain an adjusted op-amp signal.
As shown in fig. 4, another schematic diagram of a switching circuit using an adjusting circuit according to the present invention is different from the schematic diagram shown in fig. 3 in that only the output feedback signal FB is adjusted in the circuit, the adjusting principle is similar to that of the reference signal VREF shown in fig. 3, the adder in fig. 3 is changed into a subtractor, the compensation amount generating circuit U202 generates the adjusting amount V1, the subtractor U201 subtracts FB' =fb-V1 from the output feedback signal FB and the adjusting amount V1, the absolute value V1 of V1 is changed along with the output voltage, preferably the absolute value V1 is positively correlated with the output voltage, further preferably in proportion, and the adjusted operational amplification signal is obtained.
In the invention, the adjustment of the reference signal VREF or/and the output feedback signal FB is equivalent to the adjustment of the difference value of the reference signal VREF and the feedback signal FB, and when the load is reduced, a positive adjustment amount is superposed on the basis of the difference value of the reference signal VREF and the feedback signal FB; no matter how VREF or/and FB is regulated, the regulation quantity is added on the basis of the difference value between VREF and FB; besides adjusting the difference between VREF and FB, the gain G of the operational amplifier can be adjusted, namely the difference between VREF and FB and the gain G can be adjusted simultaneously, and either one of the difference between VREF and FB and the gain G can be adjusted; the adjustment amount may be a fixed value, or the adjustment amount size is positively correlated with the load reduction amount, or the adjustment amount size follows the output voltage variation, is positively correlated with the output voltage, and is preferably proportional; the adjustment of the input error of the operational amplifier and/or the gain of the operational amplifier is equivalent to the adjustment of the output signal of the operational amplifier, and the invention can also select the direct adjustment of the output signal of the operational amplifier, see fig. 5 and the description thereof.
As shown in fig. 5, another schematic diagram of a switching circuit using an adjusting circuit according to the present invention is different from the schematic diagrams shown in fig. 3 and 4 in that only the output signal of the op-amp is directly adjusted in the circuit, the adjusting principle is similar to that shown in fig. 3 and 4, the adjusting amount V2 generated by the adjusting amount generating circuit U202 is superimposed with the output signal of the op-amp U03 through an adder to obtain an adjusted operational amplification signal, and the adjusting amount V2 is used for canceling or suppressing the variable amount of the output signal of the op-amp; the magnitude of the adjustment amount V2 may be a fixed value or may be set according to the load magnitude or the output voltage.
In the present invention, it is also possible to detect a change in load by detecting a change in output current or an electric signal of a switching circuit node, in addition to detecting an output voltage; the regulating variable of the invention can be a fixed value besides regulating according to the output electricity, or the absolute value of the regulating variable is positively correlated with the load; the setting adjustment quantity changes along with the change of the output voltage, so that the operational amplifier can be adjusted more accurately; when the adjustment quantity is set to be a fixed value, the adjustment quantity is not required to be set by detecting other variables, and the setting is simple; when the adjustment quantity is set according to the load reduction quantity, the load reduction quantity is required to be detected, but the output of the operational amplifier can be properly adjusted according to the load reduction quantity; the time for generating the enable signal EN by the enable circuit is the duration of the operational amplifier adjustment, can be fixed time or is in positive correlation with the load reduction amount, and does not need to detect the reduction amount when the enable time is fixed time, so that the setting is simple; when the enabling time is set according to the magnitude of the load reduction amount, the magnitude of the load reduction amount needs to be detected, but the output of the operational amplifier can be adjusted more appropriately.
As shown in fig. 6, another schematic diagram of a switching circuit employing an adjusting circuit according to the present invention is shown, where the adjusting circuit is an adjusting device and an output signal detecting circuit U01 disposed at an output end of an operational amplifier, the adjusting device is an impedance circuit, and includes an adjusting tube M1 and an enabling circuit U02 connected to the output end of the operational amplifier, and when a load reduction is detected by the output signal detecting circuit U01, the adjusting tube has two adjusting modes, and one adjusting mode is: the enabling circuit U02 outputs an enabling signal EN to control the adjusting tube M1 to be disconnected, the output of the operational amplifier U03 is cut off, after a period of enabling, the adjusting tube is controlled to be connected, the enabling time is fixed time or is set to be positively correlated with the load reduction amount, and the operational amplifier output signal before the load reduction is used for controlling the switch state in a period of enabling time after the load reduction; another adjusting mode is as follows: the enabling circuit U02 outputs an enabling signal EN to control the on-resistance of the adjusting tube M1 to be increased, the increasing amount of the on-resistance can be a fixed value or is positively correlated with a load or is set to be positively correlated with the output voltage, the adjusting tube is controlled to be fully conducted after a period of enabling, and the enabling time is fixed time or is set to be positively correlated with the load decreasing amount; when the on-resistance of the control adjusting tube M1 is increased, the driving voltage of the tube M1 can be correspondingly adjusted through the output voltage Vo of the switch circuit, so that the on-resistance of the adjusting tube M1 is changed along with the output voltage, when the difference value between the output voltage of the switch circuit and the expected output voltage reaches a certain range, or after a period of time, the enable circuit U02 controls the adjusting tube M1 to be fully conducted, so that when the load is reduced, the operational amplification signal is changed in a small amplitude within a first voltage range, and the excessive change amplitude is avoided; according to the embodiment, the output of the operational amplifier is disconnected or impedance is applied to the output of the operational amplifier to inhibit the change of the operational amplification signal, so that the operational amplification signal is inhibited within a certain range, and the influence of load reduction on the output of the operational amplifier is avoided.
As shown in fig. 7, another schematic diagram of a switching circuit employing an adjusting circuit according to the present invention is shown, where the adjusting circuit is an adjusting device and an output signal detecting circuit U01 disposed at an output end of an operational amplifier, and the adjusting device is an impedance circuit, and includes a switch K1 and a resistor R1 connected to the output end of the operational amplifier; when the output signal detection circuit U01 detects that the load is reduced, the enabling circuit U02 outputs the enabling signal EN to control the switch K1 to be disconnected, the resistor R1 is connected to the output end of the operational amplifier U03 for a period of time, the output variation of the operational amplifier is prevented to a certain extent, and the variation amplitude of the operational amplifier is small. The enabling time of the impedance circuit connected to the output end of the operational amplifier is controlled to be fixed time or is positively correlated with the load reduction; the impedance circuit can also select other resistive circuit elements or circuit structures, such as an adjusting tube with certain impedance, so that the change amplitude of the operational amplifier output is reduced when the load is reduced, thereby inhibiting the change of the operational amplifier output.
As shown in fig. 8, an output waveform diagram of the switching circuit of the present invention is illustrated, taking the adjustment of the reference signal VREF as an example, when the load is not reduced and the operational amplifier is not adjusted, waveforms of related signals are shown by a dotted line in the diagram, the output voltage Vout and the feedback signal FB (not shown in the FB waveform diagram) are rapidly increased and then reduced to stable values, and the operational amplifier signal COMP is rapidly reduced and then increased for a period of time and then is restored to stable; in the figure, taking the adjustment of the reference signal VREF as an example when the load is reduced, the reference signal VREF is increased after the adjustment amount is overlapped in the enabling time t1 and t2, the falling amplitude of the output voltage Vout is reduced, the falling amplitude of the output feedback signal FB is reduced, and as can be seen from the figure, the larger the load reducing amplitude is, the longer the enabling time (t 2> t 1), the adjustment amount of the reference signal VREF (the waveform of a convex part in the VREF waveform) changes along with the output voltage Vout in the same trend, and the change amplitude of the operational amplification signal COMP is greatly reduced and is more stably recovered to a stable value; the switching circuit can respond to the change of the load better in the next loading, particularly in the switching circuit with frequent load change, so that the load reduction does not influence the response capability in the loading process, and the switching circuit has better output characteristics.
The load described in the present invention includes a resistive load, a capacitive load, a inductive load, a resistive-inductive load, a motor, an LED, and the like, and is not limited to a certain type or a certain type of load; taking a resistive load as an example, the load size refers to the size of a load resistor, the size of a load current or the size of consumed electric energy; the broad definition of loads in power electronics systems applies to the present invention.
In addition, although the embodiments are described and illustrated separately above, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and that reference may be made to another embodiment without explicitly recited in one of the embodiments.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.

Claims (21)

1. An operational amplifier adjusting method, the operational amplifier is applied in a switch circuit, and is characterized in that: the operational amplifier is used for carrying out operational amplification on the reference signal and an output feedback signal of the switching circuit to obtain an operational amplification signal, so as to control the switching state of the switching circuit;
and detecting the load of the switching circuit, and setting an adjusting device at the input end of the operational amplifier or/and the output end of the operational amplifier when the load is reduced, wherein the adjusting device is used for adjusting the operational amplification signal so as to inhibit the change of the operational amplification signal.
2. The method for adjusting an operational amplifier according to claim 1, wherein: and when the reduction amount of the load is larger than a first threshold value, setting a regulating device at the input end of the operational amplifier or/and the output end of the operational amplifier, wherein the regulating device is used for regulating the operational amplification signal so as to inhibit the change of the operational amplification signal.
3. The method for adjusting an operational amplifier according to claim 1, wherein: the adjusting means is for adjusting the op amp signal to be unchanged for a period of time as the load decreases.
4. The method for adjusting an operational amplifier according to claim 1, wherein: when the adjusting device is arranged at the output end of the operational amplifier, the adjusting device is an impedance circuit.
5. The operational amplifier adjusting method according to claim 4, wherein: the impedance circuit is an adjusting resistor, and when the load is reduced, the adjusting resistor is connected to the output end of the operational amplifier.
6. The operational amplifier adjusting method according to claim 4, wherein: the impedance circuit is an adjusting tube, and when the load is reduced, the on-resistance of the adjusting tube is controlled to be increased or the adjusting tube is controlled to be turned off.
7. The operational amplifier adjustment method according to claim 1 or 2, characterized in that: the adjusting means comprises an adder or a subtractor for superimposing the adjustment amount on the reference signal, or/and subtracting the adjustment amount on the output feedback signal, or/and superimposing the adjustment amount on the op-amp output signal.
8. The operational amplifier adjusting method according to claim 7, wherein: when the input signal or/and the output signal of the operational amplifier are regulated, the regulating quantity is a fixed value; alternatively, the magnitude of the adjustment amount is positively correlated with the load reduction amount; alternatively, the magnitude of the adjustment amount varies in positive correlation with the output voltage of the switching circuit.
9. The method for adjusting an op-amp according to any one of claims 1-8, wherein: the operational amplifier is regulated to have a duration that is a fixed time or positively correlated with the amount of reduction of the load.
10. The operational amplifier adjustment method according to claim 1 or 2, characterized in that: the change in the load is detected by detecting a change in the output signal of the switching circuit.
11. The operational amplifier adjustment method according to claim 10, wherein: the output signal is the output voltage or the output current of the switching circuit.
12. The operational amplifier adjustment method according to claim 11, wherein: and when the change rate or the change amount of the output voltage or the output current with time reaches a corresponding threshold value, characterizing that the load reduction reaches a corresponding threshold value.
13. The operational amplifier adjustment method according to claim 1 or 2, characterized in that: the change in the load is detected by detecting a change in an electrical signal of the switching circuit node.
14. An operational amplifier adjusting method, the operational amplifier is applied in a switch circuit, and is characterized in that: the operational amplifier is used for carrying out operational amplification on the reference signal and an output feedback signal of the switching circuit to obtain an operational amplification signal, so as to control the switching state of the switching circuit;
reducing the gain of the op-amp to suppress variations in the op-amp signal when the load is reduced; the variation of the operational amplifier gain is a fixed value, or is positively correlated with the reduction of the load, or is positively correlated with the output voltage of the switching circuit.
15. An operational amplifier's governing circuit, the operational amplifier is applied to in the switching circuit, its characterized in that: the operational amplifier is used for carrying out operational amplification on the reference signal and an output feedback signal of the switching circuit to obtain an operational amplification signal, and the operational amplification signal is used for controlling the switching state of the switching circuit; the regulating circuit comprises a circuit which is connected with the power supply,
and the adjusting device is connected with the input end or/and the output end of the operational amplifier and is used for adjusting the operational amplification signal when the load of the switching circuit is reduced so as to inhibit the change of the operational amplification signal.
16. The operational amplifier adjusting circuit of claim 15, wherein: when the adjusting device is arranged at the output end of the operational amplifier, the adjusting device comprises a first switch and an adjusting resistor, the first switch and the adjusting resistor are connected in parallel at the output end of the operational amplifier, and when the load is reduced, the first switch is turned off.
17. The operational amplifier adjusting circuit of claim 15, wherein: when the load is reduced, the adjusting device controls the on-resistance of the adjusting tube to be increased or controls the adjusting tube to be turned off.
18. The operational amplifier adjusting circuit of claim 15, wherein: the adjusting device comprises an adder or a subtracter, and the adjusting device comprises the adder or the subtracter and is used for superposing the adjusting quantity on the reference signal, or/and subtracting the adjusting quantity on the output feedback signal, or/and superposing the adjusting quantity on the operational amplifier output signal.
19. The operational amplifier regulation circuit of claim 18, wherein: the adjusting device further comprises an adjusting quantity generating circuit for generating the adjusting quantity, wherein the adjusting quantity is a fixed value; alternatively, the magnitude of the adjustment amount is positively correlated with the amount of reduction of the load; alternatively, the absolute value of the adjustment amount varies in positive correlation with the output voltage.
20. An operational amplifier adjusting circuit according to any one of claims 15-19, wherein: the adjusting device further comprises an adjusting enabling circuit for adjusting the operational amplifier to have a certain duration, and the adjusting enabling circuit controls the duration to be fixed time or positively related to the reduction of the load.
21. A switching circuit comprising a power tube and a controller, the controller controlling the switching state of the power tube, characterized in that: the controller comprises an operational amplifier and the adjusting circuit of any one of claims 15-20, wherein the operational amplifier is used for carrying out operational amplification on a reference signal and an output feedback signal to obtain an operational amplification signal, and the adjusting circuit is used for adjusting the operational amplification signal when the load of the switching circuit is reduced so as to inhibit the change of the operational amplification signal.
CN202211676408.1A 2022-12-26 2022-12-26 Operational amplifier adjusting method, operational amplifier adjusting circuit and switching circuit using operational amplifier adjusting circuit Pending CN116365838A (en)

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