CN115425841B - Compensation circuit and control method and device thereof, electronic equipment and medium - Google Patents

Compensation circuit and control method and device thereof, electronic equipment and medium Download PDF

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Publication number
CN115425841B
CN115425841B CN202211366519.2A CN202211366519A CN115425841B CN 115425841 B CN115425841 B CN 115425841B CN 202211366519 A CN202211366519 A CN 202211366519A CN 115425841 B CN115425841 B CN 115425841B
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adjustable resistor
compensation circuit
value
equivalent
adjustable
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CN115425841A (en
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陈廷仰
廖志洋
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Yuchuang Semiconductor Shenzhen Co ltd
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Yuchuang Semiconductor Shenzhen Co ltd
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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
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • 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
    • H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
    • 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
    • H02M3/158—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 including plural semiconductor devices as final control devices for a single load

Abstract

The application discloses a compensation circuit and a control method thereof, a device, electronic equipment and a medium, relates to the technical field of electronic circuits, and is used for matching with a switching power supply chip for use, and aims to solve the problems that the application switching frequency range of the current compensation circuit is narrow and the miniaturization requirement cannot be met. And the required equivalent capacitance value is realized by adjusting the resistance value of the adjustable resistor, and the requirement can be met without selecting a large capacitance value capacitor, so that the miniaturization of the compensation circuit is favorably realized.

Description

Compensation circuit and control method and device thereof, electronic equipment and medium
Technical Field
The present disclosure relates to electronic circuits, and particularly to a compensation circuit, a control method and apparatus thereof, an electronic device, and a medium.
Background
In order to achieve high integration and reduce the size of a printed circuit board, a compensation circuit is usually disposed inside a current direct current-direct current (DC-DC) switching power supply chip, and a conventional compensation circuit is shown in fig. 1 and includes: an Error Amplifier (EA), an equivalent resistor Rx, an equivalent capacitor Cx, and the like.
However, in the actual use of the switch power supply chip, the bandwidth of the closed loop system must not exceed one fifth of the switching frequency, so the switch power supply chips with different switching frequencies should be matched with poles and zeros in different frequency ranges to reflect to the compensation circuit, that is, the equivalent resistance and the equivalent capacitance need to be changed. Therefore, the applicable switching frequency range of the current compensation circuit architecture is limited and not flexible enough.
In addition, the lower switching frequency must be in the lower frequency range, and the equivalent resistance and the equivalent capacitance of the corresponding compensation circuit are higher, which is reflected in the practice, i.e. the larger the occupied area is, and the problem of the increase of the occupied area caused by the increase of the capacitance is particularly prominent, which is not favorable for reducing the circuit area of the switching power supply chip.
Therefore, there is a need for a compensation circuit that solves the problems of the conventional compensation circuit that the applied switching frequency range is narrow and the circuit size cannot meet the miniaturization requirement when applied to the low-frequency switching frequency.
Disclosure of Invention
The present application aims to provide a compensation circuit, a control method and device thereof, an electronic device, and a medium, so as to solve the problems that the current compensation circuit has a narrow switching frequency range and the circuit volume cannot meet the miniaturization requirement when applied to a low-frequency switching frequency.
To solve the above technical problem, the present application provides a compensation circuit, including: the circuit comprises an error amplifier, a controller, a first adjustable resistor, a second adjustable resistor, a third adjustable resistor, an operational amplifier and a first capacitor;
the COMP end of the error amplifier is connected with the first end of the third adjustable resistor; the second end of the third adjustable resistor is respectively connected with the first ends of the first adjustable resistor and the second adjustable resistor; the second end of the first adjustable resistor is connected with the inverting input end of the operational amplifier; the second end of the second adjustable resistor is connected with the positive input end of the operational amplifier respectively; the second end of the first capacitor is grounded; the output end of the operational amplifier is connected with the inverting input end;
the controller is connected with the first adjustable resistor, the second adjustable resistor and the third adjustable resistor and used for adjusting the resistance value.
Preferably, the error amplifier includes: the first PMOS tube, the second PMOS tube, the third PMOS tube, the OP/OTA, the fourth adjustable resistor and the fifth adjustable resistor;
the source electrode of the first PMOS tube is connected with the VDD end of the power supply, and the drain electrode of the first PMOS tube is connected with the source electrodes of the second PMOS tube and the third PMOS tube;
the grid electrode of the second PMOS tube is used as a VREF end of the error amplifier, and the drain electrode of the second PMOS tube is connected with the positive input end of the OP/OTA and is grounded through a fourth adjustable resistor;
the grid electrode of the third PMOS tube is used as the FB end of the error amplifier, and the drain electrode of the third PMOS tube is connected with the reverse input end of the OP/OTA and is grounded through a fifth adjustable resistor;
the output end of the OP/OTA is used as a COMP end of the error amplifier;
the fourth adjustable resistor and the fifth adjustable resistor are connected with the controller, and the resistance values are controlled by the controller.
Preferably, the adjustable resistor is formed by connecting a plurality of resistor units in series, and each resistor unit is formed by connecting a resistor and a switch in parallel;
correspondingly, the controller is connected with the adjustable resistor and comprises: the controller is connected with each switch in the adjustable resistor.
Preferably, the fourth adjustable resistor and the fifth adjustable resistor comprise the same number of resistor units.
In order to solve the above technical problem, the present application further provides a compensation circuit control method, applied to the above compensation circuit, including:
obtaining an equivalent resistance value and an equivalent capacitance value required by a compensation circuit;
determining target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit;
and sending corresponding control signals to control the first adjustable resistor, the second adjustable resistor and the third adjustable resistor to reach corresponding target resistance values.
Preferably, the determining the target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit includes:
determining target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit by using a first formula and a second formula;
wherein the first formula is:
Figure 72133DEST_PATH_IMAGE001
Figure 71576DEST_PATH_IMAGE002
represents an equivalent resistance value>
Figure 312064DEST_PATH_IMAGE003
Represents a target resistance value of the first adjustable resistor, and->
Figure 403648DEST_PATH_IMAGE004
Represents a target resistance value of the second adjustable resistor, and->
Figure 817312DEST_PATH_IMAGE005
A target resistance value representing a third adjustable resistance;
the second formula is:
Figure 588039DEST_PATH_IMAGE006
Figure 61746DEST_PATH_IMAGE007
represents the equivalent capacitance value, < >>
Figure 906205DEST_PATH_IMAGE008
Representing the capacitance value of the first capacitor.
Preferably, the error amplifier comprises a compensation circuit with a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, an OP/OTA, a fourth adjustable resistor and a fifth adjustable resistor, and the method further comprises:
determining a target equivalent input transconductance value of the error amplifier according to the equivalent resistance value and the equivalent capacitance value;
determining target resistance values of a fourth adjustable resistor and a fifth adjustable resistor according to the target equivalent input transconductance value;
and sending corresponding control signals to control the fourth adjustable resistor and the fifth adjustable resistor to reach corresponding target resistance values.
Preferably, the determining the target equivalent input transconductance value of the error amplifier according to the equivalent resistance value and the equivalent capacitance value comprises:
determining a target equivalent input transconductance value of the error amplifier by a third formula according to the equivalent resistance value and the equivalent capacitance value;
wherein the third formula is:
Figure 857980DEST_PATH_IMAGE009
/>
Figure 2654DEST_PATH_IMAGE010
represents a transfer function, <' > based on>
Figure 647262DEST_PATH_IMAGE011
Representing a COMP terminal voltage value, <' > based on>
Figure 979017DEST_PATH_IMAGE012
Represents the FB terminal voltage value>
Figure 734484DEST_PATH_IMAGE013
Represents a target equivalent input transconductance value, < '> or <' > of the error amplifier>
Figure 202505DEST_PATH_IMAGE014
Representing the resistance of the equivalent output resistance of the error amplifier, s being the complex variable in the transfer function.
Preferably, the determining the target resistance values of the fourth adjustable resistor and the fifth adjustable resistor according to the target transconductance value includes:
determining target resistance values of a fourth adjustable resistor and a fifth adjustable resistor according to a fourth formula according to the target equivalent input transconductance value;
wherein the fourth formula is:
Figure 18015DEST_PATH_IMAGE015
Figure 837066DEST_PATH_IMAGE016
represents the transconductance value of a second PMOS tube>
Figure 396223DEST_PATH_IMAGE017
Represents the transconductance value of a third PMOS tube>
Figure 984331DEST_PATH_IMAGE018
Represents the transconductance value of the PMOS tube connected with the third PMOS tube in the OP/OTA, and is greater than or equal to>
Figure 705162DEST_PATH_IMAGE019
Represents a target resistance value of the fourth adjustable resistor, and->
Figure 11509DEST_PATH_IMAGE020
Representing a target resistance value of the fifth adjustable resistor.
In order to solve the above technical problem, the present application further provides a compensation circuit control device, including:
the parameter acquisition module is used for acquiring an equivalent resistance value and an equivalent capacitance value required by the compensation circuit;
the resistance value determining module is used for determining target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit;
and the resistance control module is used for sending corresponding control signals to control the first adjustable resistor, the second adjustable resistor and the third adjustable resistor to reach corresponding target resistance values.
In order to solve the above technical problem, the present application further provides an electronic device, including:
a memory for storing a computer program;
a processor for implementing the steps of the compensation circuit control method as described above when executing the computer program.
In order to solve the above technical problem, the present application further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the compensation circuit control method as described above.
The utility model provides a pair of compensating circuit, through the negative feedback loop that comprises operational amplifier collocation electric capacity and three resistance adjustable resistor, connect equivalent resistor and equivalent capacitor at error amplifier COMP end in replacing traditional compensating circuit, and through the resistance value of controller control first, the second, the third adjustable resistor, realize the effect of different equivalent resistor values of simulation and equivalent capacitance value, compensating circuit's flexibility has been improved greatly, can satisfy the requirement of different switching frequency switching power supply chips. And the equivalent capacitance value is realized by adjusting the resistance values of the first, second and third adjustable resistors, so that even under the application scene of lower switching frequency, the requirement of the equivalent capacitance value is met without selecting a capacitor with a large capacitance value, and the circuit structure formed by the adjustable resistors, the operational amplifier and other devices is far smaller than the area of the large capacitor, thereby being beneficial to the miniaturization of a compensation circuit and better reducing the area of a printed circuit board of the switching power supply chip.
The compensation circuit control method, the compensation circuit control device, the electronic device and the computer readable storage medium correspond to the compensation circuit, and the effects are the same as the effects.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings required for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without inventive effort.
FIG. 1 is a diagram of a conventional compensation circuit;
FIG. 2 is a block diagram of a compensation circuit according to the present invention;
FIG. 3 is a block diagram of an adjustable resistor according to the present invention;
FIG. 4 is a block diagram of an error amplifier provided by the present invention;
FIG. 5 is a block diagram of an OP/OTA in accordance with the present invention;
FIG. 6 is a flow chart of a method for adjusting the equivalent capacitance and the resistance according to the present invention;
FIG. 7 is a flow chart of a method for adjusting transconductance values of an error amplifier according to the present invention;
FIG. 8 is a structural diagram of a control device of a compensation circuit according to the present invention;
fig. 9 is a structural diagram of an electronic device provided in the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide a compensation circuit, a control method and device thereof, electronic equipment and a medium.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
In the field of electronic circuits, on the premise of ensuring performance, the pursuit of miniaturization of various electrical components is a mainstream trend, and the same is true for a dc-dc switching power supply chip.
The existing power supply chip has a compensation circuit inside, and the poles and zeros of the transfer function a(s) of the compensation circuit are determined by the circuit structure and the parameters of the used electrical components, and are fixed and unchangeable. However, because the pole and the zero of the compensation circuit need to be matched with the switching frequency of the power supply chip, the fixed pole and the zero cannot be well adapted to the switching frequency in a large range, and the flexibility and the universality are insufficient.
In addition, in practical application, when the switching frequency of the power chip is lower, the equivalent resistance Rx and the equivalent capacitance Cx required by the matched compensation circuit are larger, and the larger capacitance value of the capacitor generally occupies larger area, which is not beneficial to the miniaturization of the power chip and does not meet the requirements of practical production and living.
To solve the above problem, the present application provides a compensation circuit, as shown in fig. 2, including: the circuit comprises an error amplifier, a controller, a first adjustable resistor R1, a second adjustable resistor R2, a third adjustable resistor R3, an operational amplifier OP and a first capacitor C1;
the COMP end of the error amplifier is connected with the first end of the third adjustable resistor R3; the second end of the third adjustable resistor R3 is respectively connected with the first ends of the first adjustable resistor R1 and the second adjustable resistor R2; the second end of the first adjustable resistor R1 is connected with the inverting input end of the operational amplifier OP; the second end of the second adjustable resistor R2 is respectively connected with the positive input end of the operational amplifier OP; the second end of the first capacitor C1 is grounded; the output end of the operational amplifier OP is connected with the reverse input end;
the controller is connected with the first adjustable resistor R1, the second adjustable resistor R2 and the third adjustable resistor R3 and used for adjusting the resistance value.
Among them, the controller may be preferably a One Time Programmable (OTP) or a Multi Time Programmable (MTP) Programmable logic device. The resistance values of the first adjustable resistor R1, the second adjustable resistor R2 and the third adjustable resistor R3 are controlled by a program which is pre-programmed into the OTP/MTP, different equivalent resistance values and equivalent capacitance values are simulated, and then the pole and the zero of the transfer function A(s) of the compensating circuit are adjusted to adapt to different switching frequencies of the power supply chip.
For each of the above adjustable resistors, there are many mature adjustable resistor products, and the mature adjustable resistor products can be used in the compensation circuit of the above embodiment in cooperation with a corresponding resistance control manner. However, in view of the above preferred embodiment of providing a controller, in order to implement resistance control on the adjustable resistor by using an OTP/MTP as a programmable logic device, and control other devices by using an electrical signal, this embodiment also provides an embodiment of an adaptive adjustable resistor for such a control manner, as shown in fig. 3:
the adjustable resistor is formed by connecting a plurality of resistor units in series, and each resistor unit is formed by a resistor and a switch which are connected in parallel;
correspondingly, the controller is connected with the adjustable resistor and comprises: the controller is connected with each switch in the adjustable resistor.
The OTP/MTP can control the on/off of each resistance unit switch through a control signal with a specific bit number. Generally, the number of bits of the control signal for controlling the adjustable resistor should be consistent with the number of the resistor units, each bit represents a high level or a low level by "1" and "0", and then the on/off of the switch of the resistor unit is controlled. When the switch of a certain resistance unit is closed, the resistance is short-circuited and not connected into the circuit, and when the switch of the resistance unit is opened, the resistance is connected into the circuit and is connected with the circuits connected into the circuit in other resistance units in series to form the resistance value of the adjustable resistance.
Based on the above embodiment, the resistance value adjustment principle of the adjustable resistor is as follows, taking the first adjustable resistor R1 as an example:
Figure 108778DEST_PATH_IMAGE021
wherein n represents the number of the resistor units of the first adjustable resistor R1 and also represents the number of bits of the corresponding control signal;
Figure 816971DEST_PATH_IMAGE022
the value of the ith bit of the control signal is represented, and the value is taken from 0 or 1; />
Figure 708704DEST_PATH_IMAGE023
And the resistance value of the ith resistance unit of the first adjustable resistor R1 is shown.
In addition, in order to reduce the angle required by the control signal of the controller, the resistance values of all the resistance units in the same adjustable resistor can be preferably the same, so that the controller can control the resistance value of the adjustable resistor only by controlling the number of the resistors connected into the circuit, and the specific one of the resistance units does not need to be opened or closed accurately.
In practical application, the two embodiments that each resistance unit adopts the same or different resistance value have respective advantages, the same resistance value of the resistance units can reduce the requirement on the control signal of the controller, and different resistance values can combine more resistance values under the condition that the resistance units are fixed, so that the adjustable resistance value range is improved. One skilled in the art can select an appropriate embodiment according to actual needs, and the application is not limited thereto.
It should be noted that, in practical applications, the first adjustable resistor R1, the second adjustable resistor R2, and the third adjustable resistor R3 are usually controlled by control signals with different digits, and correspondingly, the resistor units used for combination are also different, so as to achieve resistance adjustment in a wider range, that is, to improve the analog range of the equivalent resistance value and the equivalent capacitance value, and to adapt to a wider power switch switching frequency.
Further, the principle of simulating different equivalent resistance values and equivalent capacitance values by adjusting the resistances of the first adjustable resistor R1, the second adjustable resistor R2 and the third adjustable resistor R3 is shown as follows:
Figure 502348DEST_PATH_IMAGE001
Figure 403308DEST_PATH_IMAGE006
/>
Figure 434849DEST_PATH_IMAGE002
represents an equivalent resistance value, <' > based on>
Figure 763062DEST_PATH_IMAGE003
Represents a target resistance value of the first adjustable resistor R1, is present>
Figure 778422DEST_PATH_IMAGE004
Represents the target resistance value of the second adjustable resistor R2, is greater than or equal to>
Figure 483073DEST_PATH_IMAGE005
Represents a target resistance value of the third adjustable resistance R3; />
Figure 165858DEST_PATH_IMAGE007
Represents the equivalent capacitance value, < >>
Figure 664973DEST_PATH_IMAGE008
Representing the capacitance value of the first capacitor C1.
After different equivalent resistance values and equivalent capacitance values are simulated by adjusting the resistance values of the first adjustable resistor R1, the second adjustable resistor R2 and the third adjustable resistor R3, a transfer function A(s) formed by the compensation circuit is as follows:
Figure 167630DEST_PATH_IMAGE009
Figure 613654DEST_PATH_IMAGE010
represents a transfer function, < >>
Figure 10001DEST_PATH_IMAGE011
Represents a COMP terminal voltage value, </or >>
Figure 555383DEST_PATH_IMAGE012
Represents the FB terminal voltage value>
Figure 669969DEST_PATH_IMAGE013
Represents a target equivalent input transconductance value, < '> or <' > of the error amplifier>
Figure 591789DEST_PATH_IMAGE014
Representing the resistance of the equivalent output resistance of the error amplifier, s being the complex variable in the transfer function.
Through the zero point and the pole which can be actually needed, the corresponding equivalent resistance value and the equivalent capacitance value are obtained through deduction, and then the target resistance values of the three adjustable resistors are obtained.
It should be further noted that, as can be seen from the above principle, the equivalent capacitance value can be realized by adjusting the resistance values of the first adjustable resistor R1 and the second adjustable resistor R2, so as to select the first capacitor C1, a capacitor with an area as small as possible can be selected within an allowable range, and when the switching frequency of the power chip is low and a higher equivalent capacitance value is required, the first capacitor C1 can realize an effect equivalent to the equivalent capacitance value provided by a large capacitor by adjusting the resistance values of the first adjustable resistor R1 and the second adjustable resistor R2 through the analog effect of the compensation circuit. Moreover, as is clear to those skilled in the art, the area occupied by the large capacitor is far larger than the area occupied by the three resistors, so that the compensation circuit can control the power supply chip not to be too large due to the low switching frequency, and is beneficial to realizing the miniaturization of the power supply chip, besides the range of the switching frequency of the power supply chip can be enlarged.
The compensation circuit provided by the application has the advantages that the effect of replacing the equivalent resistor and the equivalent capacitor at the output end of the error amplifier is achieved through the three adjustable resistors, the operational amplifier and the capacitor, the adjustable resistors can achieve resistance adjustment through the controller, the equivalent resistor and the equivalent capacitor with different values are simulated, then the zero point and the pole of the transfer function A(s) of the compensation circuit are adjustable, the compensation circuit is suitable for the switching frequency of a power supply chip in a wider range, and flexibility and applicability are improved. In addition, because different equivalent capacitance values can be realized by adjusting the resistance value of the resistor, the capacitor with smaller capacitance value can be selected when the capacitor is selected, the floor area is reduced, the miniaturization of a power supply chip is more facilitated, and the practical application requirement is met.
In view of the above, the compensation circuit provided by the present application can adjust the resistance values of the three adjustable resistors through the controller to realize different equivalent resistance values and equivalent capacitance values required by the output end of the analog error amplifier. However, since the equivalent resistance value and the equivalent capacitance value are changed, that is, the Feedback Ratio of the error amplifier (Feedback Ratio = VOUT/FB) is changed, the transconductance of the error amplifier should be adjusted to obtain an appropriate loop gain in order to ensure the stability of the loop.
Therefore, in order to achieve better effect and ensure the stability of the loop by using the compensation circuit, an error amplifier with adjustable transconductance is also needed. Based on this, the present example provides a preferred implementation of an error amplifier, as shown in fig. 4, the error amplifier includes:
a first PMOS tube MBP0, a second PMOS tube MPIP, a third PMOS tube MPIN, an OP/OTA, a fourth adjustable resistor RA and a fifth adjustable resistor RB;
the source electrode of the first PMOS tube MBP0 is connected with a power supply VDD end (namely a power supply positive electrode), and the drain electrode of the first PMOS tube MBP0 is connected with the source electrodes of the second PMOS tube MPIP and the third PMOS tube MPIN;
the grid electrode of the second PMOS tube MPIP is used as a VREF end (namely a reference voltage input end) of the error amplifier, and the drain electrode of the second PMOS tube MPIP is connected with the positive input end of the OP/OTA and is grounded through a fourth adjustable resistor RA;
the grid electrode of the third PMOS tube MPIN is used as an FB end (namely a feedback voltage input end) of the error amplifier, and the drain electrode of the third PMOS tube MPIN is connected with the reverse input end of the OP/OTA and is grounded through a fifth adjustable resistor RB;
the output end of the OP/OTA is used as a COMP end (namely an error voltage output end) of the error amplifier;
the fourth adjustable resistor RA and the fifth adjustable resistor RB are connected with the controller, and the resistance values are controlled by the controller.
It should be noted that the OP, i.e., the Operational Amplifier, is an Operational Amplifier, and the OTA, i.e., the Operational transmission Amplifier, is a Transconductance Amplifier, and is an Amplifier that converts an input differential voltage into an output current. The OP/OTA described above may also be implemented using either an operational amplifier or a transconductance amplifier. It should be noted that, if the error amplifier is implemented by using an operational amplifier, the operational amplifier used in the error amplifier is not the same as the operational amplifier OP mentioned in the above embodiment.
In addition, the fourth adjustable resistor RA and the fifth adjustable resistor RB may also be composed of a plurality of resistor units, the principle is the same as that in the above embodiment, and details are not described in this embodiment. However, it should be understood that the fourth adjustable resistor RA and the fifth adjustable resistor RB are used to adjust the transconductance of the error amplifier, and are different from the first adjustable resistor R1, the second adjustable resistor R2 and the third adjustable resistor R3, and for the sake of distinction, the fourth adjustable resistor RA and the fifth adjustable resistor RB are denoted by RA and RB to be different from R1, R2 and R3.
Further, for the OP/OTA in the above embodiments, this embodiment also provides an implementation of a possible circuit structure, as shown in fig. 5, the OP/OTA includes: MBP1, MP2, MP3, MP4 five PMOS tubes, MN1, MN2, MN3, MN4 four NMOS tubes.
Based on the above circuit structure, the principle of adjusting the transconductance of the error amplifier through the fourth adjustable resistor RA and the fifth adjustable resistor RB is as follows:
Figure 452429DEST_PATH_IMAGE015
Figure 293346DEST_PATH_IMAGE016
a transconductance value representing a MPIP of a second PMOS tube, based on a predetermined threshold value>
Figure 98491DEST_PATH_IMAGE017
Represents the transconductance value of the third PMOS transistor MPIN,
Figure 558422DEST_PATH_IMAGE018
represents the transconductance value of the PMOS tube connected with the MPIN of the third PMOS tube in the OP/OTA (i.e. the transconductance value of the PMOS tube MP1 in FIG. 5), ->
Figure 194940DEST_PATH_IMAGE019
Represents the target resistance value of the fourth adjustable resistor RA, <' >>
Figure 82124DEST_PATH_IMAGE020
Representing a target resistance value of the fifth adjustable resistance RB.
According to the principle formula, the proper transconductance of the error amplifier can be adjusted and used in cooperation according to different poles and zeros of the compensation circuit, and the stability of the compensation circuit is guaranteed.
It should be noted that, according to the above principle, the resistance values of the fourth adjustable resistor RA and the fifth adjustable resistor RB should be kept consistent to avoid voltage offset at the input end of the error amplifier, so the fourth adjustable resistor RA and the fifth adjustable resistor RB are preferably consistent in structure, and are adjusted by the same control signal. The two structures are consistent, and the formed resistor units are consistent in number and resistance.
The present embodiment provides a preferred implementation of an error amplifier structure, where the adjustment of transconductance of the error amplifier is implemented by using a fourth adjustable resistor RA and a fifth adjustable resistor RB, and in cooperation with the compensation circuit disclosed in the foregoing embodiment, for a switching frequency of a power chip in a wider range, the simulation of a required equivalent resistance value and an equivalent capacitance value can be implemented by adjusting resistance values of the adjustable resistors, and an appropriate transconductance value of the error amplifier is adjusted and matched to ensure stability of the compensation circuit and improve performance of the power chip.
In accordance with the compensation circuit provided in the foregoing embodiment, this embodiment further provides a control method of the compensation circuit, which is applied to the compensation circuit to adjust and control the resistance values of the adjustable resistors, as shown in fig. 6, and the specific method includes:
s11: and acquiring an equivalent resistance value and an equivalent capacitance value required by the compensation circuit.
As can be seen from the above embodiments, the equivalent capacitance and the equivalent resistance required by the compensation circuit are determined according to the switching frequency of the power chip, and since it is known to those skilled in the art to determine the zero and the pole of the transfer function a(s) required by the compensation circuit according to the switching frequency of the power chip, and further obtain the required equivalent resistance and the required equivalent capacitance, detailed descriptions of the specific calculation process in this embodiment are omitted.
S12: and determining target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit.
Similarly to the above device embodiment, step S12 may specifically be:
determining target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit by using a first formula and a second formula;
wherein the first formula is:
Figure 984352DEST_PATH_IMAGE001
Figure 779133DEST_PATH_IMAGE002
represents an equivalent resistance value>
Figure 676682DEST_PATH_IMAGE003
Represents a target resistance value of the first adjustable resistance, and>
Figure 859401DEST_PATH_IMAGE004
represents a target resistance value of the second adjustable resistor, and->
Figure 311242DEST_PATH_IMAGE005
Representing a target resistance value of the third adjustable resistance.
The second formula is:
Figure 237610DEST_PATH_IMAGE006
Figure 192928DEST_PATH_IMAGE007
represents the equivalent capacitance value, < >>
Figure 15390DEST_PATH_IMAGE008
Representing the capacitance value of the first capacitor.
S13: and sending corresponding control signals to control the first adjustable resistor, the second adjustable resistor and the third adjustable resistor to reach corresponding target resistance values.
Similarly, the embodiment is not limited to the specific form of the control signal, when the controller is implemented by using OTP or MTP, and the adjustable resistor is composed of a plurality of resistor units, each resistor unit is composed of a set of resistors and switches connected in parallel, the control signal may be an electrical signal composed of a plurality of "0" or "1", where "0" represents a low level, and "1" represents a high level for controlling the opposite on/off states of the switches of the resistor units, and the number of bits of the control signal should be consistent with the number of the corresponding resistor units.
The compensation circuit control method provided by this embodiment is applied to the compensation circuit, and according to the requirement that different power chip switching frequencies have different equivalent resistance values and equivalent capacitance values, the target resistance values of three adjustable resistors are further determined, and corresponding control signals are generated to adjust the resistance values of the adjustable resistors, so that the requirement of the switching frequencies is met. Therefore, the same compensation circuit can be applied in a wider frequency range, and the universality of the compensation circuit is improved. In addition, the effect of adjusting the equivalent capacitance value through the adjustable resistor also enables the capacitor with overlarge capacitance value to be unnecessary to select when selecting the capacitance value, thereby reducing the circuit area of the power chip and being beneficial to the miniaturization of the power chip.
In the embodiment of the above apparatus, there is also provided a preferred implementation of the error amplifier, and the function of adjusting transconductance of the error amplifier is realized by adjusting resistance values of the fourth adjustable resistor and the fifth adjustable resistor, so as to adapt to different zero points and poles of the compensation circuit, and ensure stability of the loop. Based on this, the present embodiment provides an embodiment corresponding to the method, as shown in fig. 7, the method further includes:
s21: and determining a target equivalent input transconductance value of the error amplifier according to the equivalent resistance value and the equivalent capacitance value.
Similarly to the above embodiments, on the premise that the parameters such as the required equivalent resistance value and the equivalent capacitance value are determined, other required parameters are calculated and circuit design is well known to those skilled in the art, so that detailed description is omitted in this embodiment.
S22: and determining target resistance values of the fourth adjustable resistor and the fifth adjustable resistor according to the target equivalent input transconductance value.
As disclosed in the apparatus section above, step S22 may specifically be:
determining a target equivalent input transconductance value of the error amplifier by a third formula according to the equivalent resistance value and the equivalent capacitance value;
wherein the third formula is:
Figure 813582DEST_PATH_IMAGE009
Figure 419007DEST_PATH_IMAGE010
represents a transfer function, < >>
Figure 25569DEST_PATH_IMAGE011
Represents a COMP terminal voltage value, </or >>
Figure 18932DEST_PATH_IMAGE012
Represents the FB terminal voltage value>
Figure 304420DEST_PATH_IMAGE013
Represents a target equivalent input transconductance value for an error amplifier>
Figure 447957DEST_PATH_IMAGE014
Representing the resistance of the equivalent output resistance of the error amplifier, s being the complex variable in the transfer function.
S23: and sending corresponding control signals to control the fourth adjustable resistor and the fifth adjustable resistor to reach corresponding target resistance values.
Similarly, step S23 specifically includes:
determining target resistance values of a fourth adjustable resistor and a fifth adjustable resistor according to a fourth formula according to the target equivalent input transconductance value;
wherein the fourth formula is:
Figure 502500DEST_PATH_IMAGE015
Figure 338869DEST_PATH_IMAGE016
represents the transconductance value of the second PMOS tube, < >>
Figure 846074DEST_PATH_IMAGE017
Represents the transconductance value of the third PMOS tube, < >>
Figure 793302DEST_PATH_IMAGE018
Represents the transconductance value of the PMOS tube connected with the third PMOS tube in the OP/OTA (i.e. the transconductance value of the PMOS tube MP1 in FIG. 5), -or>
Figure 967931DEST_PATH_IMAGE019
Represents a target resistance value of the fourth adjustable resistor, and->
Figure 709622DEST_PATH_IMAGE020
Representing a target resistance value of the fifth adjustable resistor.
In the preferred embodiment, the target value of the transconductance of the error amplifier is determined according to the required equivalent resistance value and the required equivalent capacitance value, the target values of the fourth adjustable resistor and the fifth adjustable resistor are determined according to the target value of the transconductance, and the corresponding control signal is sent to perform adjustment, so that the error amplifier can meet the current requirement, and the stability of the compensation circuit is ensured.
In the above embodiments, a detailed description is given of a compensation circuit control method, and the present application also provides a corresponding embodiment of a compensation circuit control device. It should be noted that the present application describes the embodiments of the apparatus portion from two perspectives, one from the perspective of the function module and the other from the perspective of the hardware.
Based on the angle of the functional module, as shown in fig. 8, the present embodiment provides a compensation circuit control device, including:
a parameter obtaining module 31, configured to obtain an equivalent resistance value and an equivalent capacitance value required by the compensation circuit;
the resistance value determining module 32 is configured to determine target resistance values of the first adjustable resistor, the second adjustable resistor, and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit;
and the resistance value control module 33 is configured to send corresponding control signals to control the first adjustable resistor, the second adjustable resistor, and the third adjustable resistor to reach corresponding target resistance values.
Since the embodiments of the apparatus portion and the method portion correspond to each other, please refer to the description of the embodiments of the method portion for the embodiments of the apparatus portion, which is not repeated here.
Fig. 9 is a block diagram of an electronic device according to another embodiment of the present application, and as shown in fig. 9, an electronic device includes: a memory 40 for storing a computer program;
the processor 41 is configured to implement the steps of the compensation circuit control method according to the above embodiment when executing the computer program.
The electronic device provided by the embodiment may include, but is not limited to, a smart phone, a tablet computer, a notebook computer, or a desktop computer.
Processor 41 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so forth. The Processor 41 may be implemented in hardware using at least one of a Digital Signal Processor (DSP), a Field-Programmable Gate Array (FPGA), and a Programmable Logic Array (PLA). The processor 41 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 41 may be integrated with a Graphics Processing Unit (GPU) which is responsible for rendering and drawing the content required to be displayed on the display screen. In some embodiments, processor 41 may further include an Artificial Intelligence (AI) processor for processing computational operations related to machine learning.
Memory 40 may include one or more computer-readable storage media, which may be non-transitory. Memory 40 may also include high speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 40 is at least used for storing a computer program 401, wherein after being loaded and executed by the processor 41, the computer program can implement the relevant steps of a compensation circuit control method disclosed in any one of the foregoing embodiments. In addition, the resources stored in the memory 40 may also include an operating system 402, data 403, and the like, and the storage manner may be a transient storage or a permanent storage. Operating system 402 may include Windows, unix, linux, and the like, among others. Data 403 may include, but is not limited to, a compensation circuit control method, etc.
In some embodiments, an electronic device may further include a display 42, an input/output interface 43, a communication interface 44, a power supply 45, and a communication bus 46.
Those skilled in the art will appreciate that the configuration shown in fig. 9 is not intended to be limiting of an electronic device and may include more or fewer components than those shown.
The electronic device provided by the embodiment of the application comprises a memory and a processor, wherein when the processor executes a program stored in the memory, the following method can be realized: a compensation circuit control method.
Finally, the application also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps as set forth in the above-mentioned method embodiments.
It is to be understood that if the method in the above embodiments is implemented in the form of software functional units and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium and executes all or part of the steps of the methods described in the embodiments of the present application, or all or part of the technical solutions. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The compensation circuit, the control method, the control device, the electronic device and the medium thereof provided by the present application are described in detail above. The embodiments are described in a progressive mode in the specification, the emphasis of each embodiment is on the difference from the other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Claims (12)

1. A compensation circuit, comprising: the circuit comprises an error amplifier, a controller, a first adjustable resistor, a second adjustable resistor, a third adjustable resistor, an operational amplifier and a first capacitor;
the COMP end of the error amplifier is connected with the first end of the third adjustable resistor; the second end of the third adjustable resistor is respectively connected with the first ends of the first adjustable resistor and the second adjustable resistor; the second end of the first adjustable resistor is connected with the inverting input end of the operational amplifier; a second end of the second adjustable resistor is respectively connected with a positive input end of the operational amplifier and a first end of the first capacitor; the second end of the first capacitor is grounded; the output end of the operational amplifier is connected with the inverting input end;
the controller is connected with the first adjustable resistor, the second adjustable resistor and the third adjustable resistor and used for adjusting the resistance value.
2. The compensation circuit of claim 1, wherein the error amplifier comprises: the first PMOS tube, the second PMOS tube, the third PMOS tube, the OP/OTA, the fourth adjustable resistor and the fifth adjustable resistor;
the source electrode of the first PMOS tube is connected with a power supply VDD end, and the drain electrode of the first PMOS tube is connected with the source electrodes of the second PMOS tube and the third PMOS tube;
the grid electrode of the second PMOS tube is used as a VREF end of the error amplifier, and the drain electrode of the second PMOS tube is connected with the positive input end of the OP/OTA and is grounded through the fourth adjustable resistor;
the grid electrode of the third PMOS tube is used as the FB end of the error amplifier, and the drain electrode of the third PMOS tube is connected with the reverse input end of the OP/OTA and is grounded through the fifth adjustable resistor;
the output end of the OP/OTA is used as a COMP end of the error amplifier;
the fourth adjustable resistor and the fifth adjustable resistor are connected with the controller, and the resistance values are controlled by the controller.
3. The compensation circuit of claim 2, wherein the adjustable resistor comprises a plurality of resistor units connected in series, and the resistor units comprise resistors and switches connected in parallel;
correspondingly, the connection of the controller and the adjustable resistor comprises: the controller is connected to each of the switches in the adjustable resistor.
4. The compensation circuit of claim 3, wherein the fourth adjustable resistance and the fifth adjustable resistance comprise the same number of resistor units.
5. A compensation circuit control method applied to the compensation circuit according to any one of claims 1 to 4, comprising:
obtaining an equivalent resistance value and an equivalent capacitance value required by the compensation circuit;
determining target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit;
and sending corresponding control signals to control the first adjustable resistor, the second adjustable resistor and the third adjustable resistor to reach corresponding target resistance values.
6. The compensation circuit control method of claim 5, wherein determining the target resistance values of the first adjustable resistor, the second adjustable resistor, and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit comprises:
determining target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to a first formula and a second formula according to an equivalent resistance value and an equivalent capacitance value required by the compensation circuit;
wherein the first formula is:
Figure DEST_PATH_IMAGE002
/>
Figure DEST_PATH_IMAGE004
represents the equivalent resistance value, <' > based on>
Figure DEST_PATH_IMAGE006
Represents a target resistance value of the first adjustable resistance, based on a predetermined threshold value>
Figure DEST_PATH_IMAGE008
Represents a target resistance value of the second adjustable resistance, and->
Figure DEST_PATH_IMAGE010
A target resistance value representing the third adjustable resistance;
the second formula is:
Figure DEST_PATH_IMAGE012
Figure DEST_PATH_IMAGE014
represents the equivalent capacitance value, < > or >>
Figure DEST_PATH_IMAGE016
Representing a capacitance value of the first capacitance.
7. The compensation circuit control method according to claim 6, applied to the compensation circuit according to claim 2, further comprising:
determining a target equivalent input transconductance value of the error amplifier according to the equivalent resistance value and the equivalent capacitance value;
determining target resistance values of the fourth adjustable resistor and the fifth adjustable resistor according to the target equivalent input transconductance value;
and sending corresponding control signals to control the fourth adjustable resistor and the fifth adjustable resistor to reach corresponding target resistance values.
8. The compensation circuit control method of claim 7, wherein determining a target equivalent input transconductance value for the error amplifier based on the equivalent resistance value and the equivalent capacitance value comprises:
determining a target equivalent input transconductance value of the error amplifier by a third formula according to the equivalent resistance value and the equivalent capacitance value;
wherein the third formula is:
Figure DEST_PATH_IMAGE018
Figure DEST_PATH_IMAGE020
represents a transfer function, < >>
Figure DEST_PATH_IMAGE022
Represents the COMP terminal voltage value +>
Figure DEST_PATH_IMAGE024
Represents the FB terminal voltage value>
Figure DEST_PATH_IMAGE026
Represents the target equivalent input transconductance value, < > or < >, of the error amplifier>
Figure DEST_PATH_IMAGE028
And the resistance value of the equivalent output resistance of the error amplifier is represented, and s is a complex variable in the transfer function.
9. The compensation circuit control method of claim 8, wherein determining the target resistance values for the fourth adjustable resistor and the fifth adjustable resistor based on the target transconductance value comprises:
determining target resistance values of the fourth adjustable resistor and the fifth adjustable resistor by a fourth formula according to the target equivalent input transconductance value;
wherein the fourth formula is:
Figure DEST_PATH_IMAGE030
Figure DEST_PATH_IMAGE032
represents the transconductance value of the second PMOS tube, < > is greater than >>
Figure DEST_PATH_IMAGE034
The transconductance value of the third PMOS tube is represented,
Figure DEST_PATH_IMAGE036
represents the transconductance value of the PMOS tube connected with the third PMOS tube in the OP/OTA, and/or the voltage level of the PMOS tube connected with the third PMOS tube>
Figure DEST_PATH_IMAGE038
Represents a target resistance value of the fourth adjustable resistor, and->
Figure DEST_PATH_IMAGE040
And representing a target resistance value of the fifth adjustable resistor.
10. A compensation circuit control device applied to the compensation circuit according to any one of claims 1 to 4, comprising:
the parameter acquisition module is used for acquiring an equivalent resistance value and an equivalent capacitance value required by the compensation circuit;
the resistance value determining module is used for determining target resistance values of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor according to the equivalent resistance value and the equivalent capacitance value required by the compensation circuit;
and the resistance value control module is used for sending corresponding control signals to control the first adjustable resistor, the second adjustable resistor and the third adjustable resistor to reach corresponding target resistance values.
11. An electronic device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the compensation circuit control method according to any one of claims 5 to 9 when executing said computer program.
12. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the compensation circuit control method according to one of the claims 5 to 9.
CN202211366519.2A 2022-11-03 2022-11-03 Compensation circuit and control method and device thereof, electronic equipment and medium Active CN115425841B (en)

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