Linear voltage stabilizing circuit and integrated circuit chip

Abstract

The application relates to the technical field of voltage stabilizing circuits, and particularly provides a linear voltage stabilizing circuit and an integrated circuit chip. The linear voltage stabilizing circuit comprises a voltage regulating module, an input end of the voltage regulating module being connected with a voltage input end; a compensation module, the output end of the voltage regulating module and the voltage input end being connected with the compensation module, the output end of the compensation module being a voltage output end, the compensation module being used for compensating an output voltage by changing an output current; a differential sampling module, an input end of the differential sampling module being connected with the voltage output end, an output end of the differential sampling module being connected with the input end of the voltage regulating module, the differential sampling module being used for sampling and amplifying the change of the output voltage to output a sampling signal; the voltage regulating module is used for adjusting the upper limit value of the output voltage according to the input voltage and adjusting the output voltage according to the sampling signal output by the differential sampling module; the linear voltage stabilizing circuit can effectively avoid the output fluctuation caused by the separate use of a resistor for voltage division sampling, thereby effectively improving the accuracy of the output voltage of the linear voltage stabilizing circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of voltage stabilizing circuit, in particular to a linear voltage stabilizing circuit and an integrated circuit chip. BACKGROUND

[0002] In order to make the integrated circuit chip work stably and reliably, the related technology needs to use a linear voltage stabilizing circuit to provide a stable and smooth voltage. The related linear voltage stabilizing circuit configures the adjustment output voltage by using a resistor alone for voltage division sampling. Since the resistance value of the resistor is a fixed value, the signal obtained by using the resistor alone for voltage division sampling is small, that is, the sampling precision of using the resistor alone for voltage division sampling may be insufficient, and the voltage division sampling using the resistor alone cannot eliminate the interference of the common-mode signal, so the output fluctuation may occur by using the resistor alone for voltage division sampling, thereby causing the output voltage of the linear voltage stabilizing circuit to be inaccurate.

[0003] At present, there is no effective technical solution to the above problems. It should be noted that the above information disclosed in this part is only used to understand the background of the present application concept, and therefore can contain information that does not constitute prior art. SUMMARY

[0004] The purpose of the present application is to provide a linear voltage stabilizing circuit and an integrated circuit chip, which can effectively avoid the output fluctuation caused by using a resistor alone for voltage division sampling, thereby effectively improving the accuracy of the output voltage of the linear voltage stabilizing circuit.

[0005] In a first aspect, the present application provides a linear voltage stabilizing circuit, comprising:

[0006] a voltage regulating module, an input end of which is connected with a voltage input end;

[0007] a compensation module, connected with the output end of the voltage regulating module and the voltage input end, and having an output end as a voltage output end, for compensating the output voltage by changing the output current;

[0008] a differential sampling module, an input end of which is connected with the voltage output end, and an output end of which is connected with the input end of the voltage regulating module, for sampling and amplifying the change of the output voltage to output a sampling signal;

[0009] The voltage regulating module is used for adjusting the upper limit value of the output voltage according to the input voltage and adjusting the output voltage according to the sampling signal output by the differential sampling module.

[0010] The linear voltage stabilizing circuit can improve the sampling precision of the output voltage and eliminate the interference of common-mode signals by using the differential sampling module to differentially sample the output voltage, thereby effectively avoiding the output fluctuation caused by using a resistor alone for voltage division sampling, and effectively improving the accuracy of the output voltage of the linear voltage stabilizing circuit.

[0011] Optionally, the differential sampling module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a capacitor and a first operational amplifier, one end of the first resistor is connected with the voltage output end, the other end of the first resistor is connected with one end of the second resistor, one end of the capacitor, one end of the third resistor and one end of the fourth resistor respectively, one end of the sixth resistor is connected with the other end of the second resistor, the other end of the third resistor, the other end of the capacitor and the ground end respectively, the other end of the fourth resistor is connected with one end of the fifth resistor and the non-inverting input end of the first operational amplifier respectively, the other end of the fifth resistor is connected with the ground end, the other end of the sixth resistor is connected with the inverting input end of the first operational amplifier and one end of the seventh resistor respectively, the other end of the seventh resistor is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is the output end of the differential sampling module, and the phase difference between the input signal of the non-inverting input end of the first operational amplifier and the input signal of the inverting input end of the first operational amplifier is 180°.

[0012] Optionally, the resistance value of the fourth resistor is the same as that of the sixth resistor, and the resistance value of the fifth resistor is the same as that of the seventh resistor.

[0013] Optionally, the voltage regulating module comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a second operational amplifier, one end of the eighth resistor is connected with the voltage input end, the other end of the eighth resistor is connected with one end of the ninth resistor and one end of the tenth resistor respectively, the other end of the ninth resistor is connected with the ground end, the other end of the tenth resistor is connected with the non-inverting input end of the second operational amplifier and one end of the thirteenth resistor respectively, one end of the eleventh resistor is connected with the output end of the differential sampling module, the other end of the eleventh resistor is connected with one end of the twelfth resistor and the inverting input end of the second operational amplifier respectively, the other end of the twelfth resistor is connected with the ground end, and the other end of the thirteenth resistor is connected with the output end of the second operational amplifier and the compensation module.

[0014] Optionally, the resistance value of the tenth resistor is the same as that of the eleventh resistor, and the resistance value of the twelfth resistor is the same as that of the thirteenth resistor.

[0015] Optionally, the compensation module comprises a third operational amplifier, a fourteenth resistor and a triode, the non-inverting input terminal of the third operational amplifier is connected with the voltage regulating module, the emitter of the triode and the voltage output terminal are respectively connected with the inverting input terminal of the third operational amplifier, the output terminal of the third operational amplifier is connected with one end of the fourteenth resistor, the other end of the fourteenth resistor is connected with the base of the triode, and the collector of the triode is connected with the voltage input terminal.

[0016] Optionally, the compensation module further comprises a slide rheostat, and the slide rheostat is connected with the emitter of the triode, the inverting input terminal of the third operational amplifier and the voltage output terminal respectively.

[0017] When the size of the load changes, the prior art needs to compensate the output voltage of the linear voltage stabilizing circuit by adjusting the size of the input voltage. Since the compensation module of the technical scheme further comprises a slide rheostat, the slide rheostat is connected with the emitter of the triode, the inverting input terminal of the third operational amplifier and the voltage output terminal respectively, the technical scheme can compensate the output voltage of the linear voltage stabilizing circuit by adjusting the resistance value of the slide rheostat, that is, when the size of the load changes, the technical scheme only needs to adjust the resistance value of the slide rheostat, and does not need to adjust the size of the input voltage, thereby effectively improving the convenience of compensating the output voltage of the linear voltage stabilizing circuit.

[0018] Optionally, the slide rheostat comprises a first slide resistance and a second slide resistance, the sum of the resistance value of the first slide resistance and the resistance value of the second slide resistance is a fixed value, one end of the first slide resistance is connected with the emitter of the triode, the other end of the first slide resistance is connected with the inverting input terminal of the third operational amplifier and one end of the second slide resistance respectively, and the other end of the second slide resistance is connected with the voltage output terminal.

[0019] Optionally, the triode is an NPN triode.

[0020] The triode of the technical scheme is an NPN triode, since the NPN triode has the advantages of small size and high reliability, the technical scheme can effectively reduce the size of the compensation module and improve the reliability of the compensation module.

[0021] In a second aspect, the application further provides an integrated circuit chip, which comprises the linear voltage stabilizing circuit provided in the first aspect.

[0022] The integrated circuit chip provided by the application can improve the sampling precision of the output voltage and eliminate the interference of common-mode signals by differentially sampling the output voltage through the differential sampling module, thereby effectively avoiding the output fluctuation caused by the separate use of resistors for voltage division sampling, effectively improving the accuracy of the output voltage of the linear voltage stabilizing circuit, and further improving the accuracy of the output voltage of the linear voltage stabilizing circuit by real-time fine adjustment of the output voltage of the linear voltage stabilizing circuit through the cooperation of the differential sampling module, the voltage regulating module and the compensation module.

[0023] As can be seen from the above, the linear voltage stabilizing circuit and the integrated circuit chip provided by the application can improve the sampling precision of the output voltage and eliminate the interference of common-mode signals by differentially sampling the output voltage through the differential sampling module, thereby effectively avoiding the output fluctuation caused by the separate use of resistors for voltage division sampling, effectively improving the accuracy of the output voltage of the linear voltage stabilizing circuit, and further improving the accuracy of the output voltage of the linear voltage stabilizing circuit by real-time fine adjustment of the output voltage of the linear voltage stabilizing circuit through the cooperation of the differential sampling module, the voltage regulating module and the compensation module. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The circuit diagram of the linear voltage stabilizing circuit provided by the embodiment of the application is shown in the figure.

[0025] Reference signs: 1, voltage regulating module; 2, compensation module; 3, differential sampling module; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; R15, first slide resistor; R16, second slide resistor; R17, fifteenth resistor; C, capacitor; AMP1, first operational amplifier; AMP2, second operational amplifier; AMP3, third operational amplifier; VIN, voltage input terminal; VOUT, voltage output terminal; BJT, triode. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work fall within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0028] First, as Figure 1 As shown, the present application provides a linear voltage stabilization circuit, which includes:

[0029] A voltage regulating module 1, whose input terminal is connected to the voltage input terminal VIN;

[0030] The compensation module 2 is connected to the output terminal and the voltage input terminal VIN of the voltage regulation module 1, and its output terminal is the voltage output terminal VOUT, which is used to compensate the output voltage by changing the output current;

[0031] The differential sampling module 3 has its input end connected to the voltage output end VOUT and its output end connected to the input end of the voltage regulation module 1, and is used to sample and amplify the change of the output voltage to output a sampling signal;

[0032] The voltage regulating module 1 is used to regulate the upper limit of the output voltage according to the input voltage and to regulate the output voltage according to the sampling signal output by the differential sampling module 3 .

[0033] The linear voltage stabilizing circuit provided by the embodiment is preferably applied in an integrated circuit chip, and the linear voltage stabilizing circuit can provide a stable and smooth voltage for the integrated circuit chip. The input end of the voltage regulating module 1 of the embodiment is connected with the voltage input end VIN and the output end of the differential sampling module 3 respectively, the voltage regulating module 1 can adjust the upper limit value of the output voltage according to the input voltage in a state with a higher input voltage and adjust the output voltage according to the sampling signal output by the differential sampling module 3, since the input end of the compensation module 2 of the embodiment is connected with the output end of the voltage regulating module 1 and the output end of the compensation module 2 is the voltage output end VOUT, the embodiment is equivalent to limiting the maximum value of the signal input from the voltage regulating module 1 to the compensation module 2 and the maximum value of the output voltage of the linear voltage stabilizing circuit by limiting the upper limit of the output voltage of the voltage regulating module 1, and the voltage regulating module 1 of the embodiment can play a role in protecting the circuit and adjusting the voltage range, so the embodiment can effectively avoid the situation that the voltage rises sharply due to the abnormality of the linear voltage stabilizing circuit. Specifically, the voltage regulating module 1 of the embodiment can be an analog circuit, which can be composed of an operational amplifier and an adjustable resistance network, and the voltage regulating module 1 of the embodiment can also be a digital control circuit, which can realize the accurate adjustment of the output voltage through a microcontroller and a digital potentiometer. The compensation module 2 of the embodiment can compensate the output voltage in real time by changing the output current. The input end of the differential sampling module 3 of the embodiment is connected with the voltage output end VOUT, and the differential sampling module 3 is used to sample and amplify the change of the output voltage to output a sampling signal, that is, the embodiment is equivalent to differentially sampling the output voltage by using the differential sampling module 3. Compared with using a resistor alone for voltage division sampling, differential sampling can more accurately sample the change of the voltage and amplify the change in proportion, that is, compared with the prior art, the embodiment can effectively increase the signal obtained after voltage division sampling, that is, the sampling accuracy of the differential sampling module 3 of the embodiment is greater than the sampling accuracy of the prior art using a resistor alone for voltage division sampling, and differential sampling has anti-interference property, that is, the differential sampling module 3 of the embodiment can eliminate the interference of common-mode signals, so the embodiment can avoid the output fluctuation by using the differential sampling module 3 to differentially sample the output voltage, thereby avoiding the situation that the output voltage of the linear voltage stabilizing circuit is not accurate due to the output fluctuation, that is, the embodiment can effectively improve the accuracy of the output voltage of the linear voltage stabilizing circuit. Preferably, the voltage output end VOUT of the linear voltage stabilizing circuit of the embodiment is connected with a load, and the load is preferably a fifteenth resistor R17, and the two ends of the fifteenth resistor R17 are respectively connected with the voltage output end VOUT and the ground end.

[0034] The present application provides a linear voltage regulator circuit that can improve the sampling accuracy of the output voltage and eliminate the interference of common-mode signals by using a differential sampling module 3 to perform differential sampling on the output voltage. Therefore, the present application can effectively avoid the output fluctuation caused by using resistors alone for voltage division sampling, thereby effectively improving the accuracy of the output voltage of the linear voltage regulator circuit. In addition, the present application can fine-tune the output voltage of the linear voltage regulator circuit in real time through the cooperation of the differential sampling module 3, the voltage regulation module 1 and the compensation module 2, thereby further improving the accuracy of the output voltage of the linear voltage regulator circuit.

[0035] In some preferred embodiments, the differential sampling module 3 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a capacitor C and a first operational amplifier AMP1, one end of the first resistor R1 is connected to the voltage output terminal VOUT, the other end of the first resistor R1 is respectively connected to one end of the second resistor R2, one end of the capacitor C, one end of the third resistor R3 and one end of the fourth resistor R4, one end of the sixth resistor R6 is respectively connected to the other end of the second resistor R2, the other end of the third resistor R3, the other end of the capacitor C and the ground terminal, and the fourth resistor R7 is respectively connected to the first resistor R1, the second resistor R2, the third resistor R3, the other end of the capacitor C and the ground terminal. The other end of the resistor R4 is respectively connected to one end of the fifth resistor R5 and the non-inverting input terminal of the first operational amplifier AMP1, the other end of the fifth resistor R5 is connected to the ground terminal, the other end of the sixth resistor R6 is respectively connected to the inverting input terminal of the first operational amplifier AMP1 and one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the output terminal of the first operational amplifier AMP1, the output terminal of the first operational amplifier AMP1 is the output terminal of the differential sampling module 3, and the phase difference between the input signal of the non-inverting input terminal of the first operational amplifier AMP1 and the input signal of the inverting input terminal of the first operational amplifier AMP1 is 180°. The differential sampling module 3 of this embodiment can accurately sample the output voltage of the linear voltage regulator circuit by using the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7. The capacitor C of this embodiment can play a filtering role to ensure the stability of the sampling signal. Therefore, the differential sampling module 3 of this embodiment effectively samples the output voltage by using a single capacitor C and multiple resistors, and uses the first operational amplifier AMP1 to adjust the sampling signal to an appropriate output signal. That is, when performing voltage regulation and compensation, the differential sampling module 3 of this embodiment can effectively improve the accuracy of the sampling signal, thereby effectively improving the accuracy of voltage regulation and voltage compensation. Specifically, the sampling signal output by the differential sampling module 3 of this embodiment is shown in formula (1): (1);

[0036] Wherein, V1 represents the sampling signal outputted by the differential sampling module 3, r4 represents the resistance value of the fourth resistor R4, r5 represents the resistance value of the fifth resistor R5, r6 represents the resistance value of the sixth resistor R6, r7 represents the resistance value of the seventh resistor R7, V out represents the output voltage of the linear voltage stabilizing circuit.

[0037] In some preferred embodiments, the resistance value of the fourth resistor R4 is the same as the resistance value of the sixth resistor R6, and the resistance value of the fifth resistor R5 is the same as the resistance value of the seventh resistor R7. Since the resistance value of the fourth resistor R4 is the same as the resistance value of the sixth resistor R6, and the resistance value of the fifth resistor R5 is the same as the resistance value of the seventh resistor R7 in this embodiment, the sampling signal outputted by the differential sampling module 3 of this embodiment is as shown in formula (2):

[0038] (2).

[0039] In some preferred embodiments, the voltage regulating module 1 comprises an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a second operational amplifier AMP2, one end of the eighth resistor R8 is connected with the voltage input terminal VIN, the other end of the eighth resistor R8 is connected with one end of the ninth resistor R9 and one end of the tenth resistor R10 respectively, the other end of the ninth resistor R9 is connected with the ground terminal, the other end of the tenth resistor R10 is connected with the non-inverting input terminal of the second operational amplifier AMP2 and one end of the thirteenth resistor R13 respectively, one end of the eleventh resistor R11 is connected with the output terminal of the differential sampling module 3, the other end of the eleventh resistor R11 is connected with one end of the twelfth resistor R12 and the inverting input terminal of the second operational amplifier AMP2 respectively, the other end of the twelfth resistor R12 is connected with the ground terminal, the other end of the thirteenth resistor R13 is connected with the output terminal of the second operational amplifier AMP2 and the compensation module 2 respectively. The eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 of this embodiment jointly form a voltage dividing network, which can perform voltage dividing processing on the input voltage, so that the non-inverting input terminal of the second operational amplifier AMP2 receives the voltage signal after voltage dividing, the sampling signal outputted by the differential sampling module 3 is inputted to the inverting input terminal of the second operational amplifier AMP2 through the eleventh resistor R11, the second operational amplifier AMP2 compares the signals received by the non-inverting input terminal and the inverting input terminal, and outputs the adjusted signal to the compensation module 2 through the thirteenth resistor R13, so as to realize accurate adjustment of the upper limit value of the output voltage. Specifically, the voltage signal between the eighth resistor R8 and the ninth resistor R9 of this embodiment is as shown in formula (3):

[0040] (3);

[0041] wherein V2 represents a voltage signal between the eighth resistor R8 and the ninth resistor R9, V in represents an input voltage, r8 represents a resistance value of the eighth resistor R8, and r9 represents a resistance value of the ninth resistor R9.

[0042] The output signal of the voltage regulating module 1 of this embodiment is shown in equation (4):

[0043] (4).

[0044] wherein V3 represents the output signal of the voltage regulating module 1, r 10 represents a resistance value of the tenth resistor R10, and r 11 represents a resistance value of the eleventh resistor R11, and r 12 represents a resistance value of the twelfth resistor R12, and r 13 represents a resistance value of the thirteenth resistor R13.

[0045] In some preferred embodiments, the resistance value of the tenth resistor R10 is the same as the resistance value of the eleventh resistor R11, and the resistance value of the twelfth resistor R12 is the same as the resistance value of the thirteenth resistor R13. Since the resistance value of the tenth resistor R10 is the same as the resistance value of the eleventh resistor R11, and the resistance value of the twelfth resistor R12 is the same as the resistance value of the thirteenth resistor R13 in this embodiment, the output signal of the voltage regulating module 1 of this embodiment is shown in equation (5):

[0046] (5).

[0047] In some preferred embodiments, the compensation module 2 comprises a third operational amplifier AMP3, a fourteenth resistor R14, and a transistor BJT. The non-inverting input terminal of the third operational amplifier AMP3 is connected to the voltage regulating module 1, the inverting input terminal of the third operational amplifier AMP3 is connected to the emitter of the transistor BJT and the voltage output terminal VOUT respectively, one end of the fourth resistor R14 is connected to the output terminal of the third operational amplifier AMP3, the other end of the fourth resistor R14 is connected to the base of the transistor BJT, and the collector of the transistor BJT is connected to the voltage input terminal VIN. When the output voltage of the linear voltage stabilizing circuit changes, the change will be fed back to the inverting input terminal of the third operational amplifier AMP3, so that the third operational amplifier AMP3 outputs an adaptive control signal according to the change, and the control signal is transmitted to the base of the transistor BJT through the fourteenth resistor R14 to adjust the working state of the transistor BJT, thereby effectively compensating the output voltage of the linear voltage stabilizing circuit.

[0048] In some preferred embodiments, the compensation module 2 further comprises a sliding resistor connected to the emitter of the triode BJT, the inverting input of the third operational amplifier AMP3 and the voltage output VOUT respectively. The stability of the output voltage of the linear voltage stabilizing circuit is affected by the change of the size of the load. In the prior art, the output voltage of the linear voltage stabilizing circuit is compensated by adjusting the size of the input voltage when the size of the load changes. Since the compensation module 2 of the embodiment further comprises a sliding resistor connected to the emitter of the triode BJT, the inverting input of the third operational amplifier AMP3 and the voltage output VOUT respectively, the output voltage of the linear voltage stabilizing circuit can be compensated by adjusting the resistance of the sliding resistor, i.e. when the size of the load changes, the embodiment only needs to adjust the resistance of the sliding resistor, without adjusting the size of the input voltage, thereby effectively improving the convenience of compensating the output voltage of the linear voltage stabilizing circuit.

[0049] In some preferred embodiments, the sliding resistor comprises a first sliding resistance R15 and a second sliding resistance R16, the sum of the resistance of the first sliding resistance R15 and the resistance of the second sliding resistance R16 is a fixed value, one end of the first sliding resistance R15 is connected to the emitter of the triode BJT, the other end of the first sliding resistance R15 is connected to the inverting input of the third operational amplifier AMP3 and one end of the second sliding resistance R16 respectively, and the other end of the second sliding resistance R16 is connected to the voltage output VOUT. It should be understood that since the third operational amplifier AMP3 of the embodiment has the characteristic of virtual short, i.e. the voltage of the non-inverting input of the third operational amplifier AMP3 is equal to the voltage of the inverting input of the third operational amplifier AMP3, the output voltage of the linear voltage stabilizing circuit of the embodiment is as shown in formula (6):

[0050] (6);

[0051] wherein V out represents the output voltage of the linear voltage stabilizing circuit, r represents the resistance of the load, and r 16 represents the resistance of the second sliding resistance R16.

[0052] In some preferred embodiments, the triode BJT is an NPN triode. Since the NPN triode has the advantages of small size and high reliability, the triode BJT of the embodiment is an NPN triode, which can effectively reduce the size of the compensation module 2 and improve the reliability of the compensation module 2.

[0053] It should be understood that, as can be seen from formula (2), the sampling signal output by the differential sampling module 3 is positively correlated with the output voltage of the linear voltage stabilizing circuit, as can be seen from formula (5), the output signal of the voltage regulating module 1 is negatively correlated with the sampling signal output by the differential sampling module 3, and as can be seen from formula (6), the output voltage of the linear voltage stabilizing circuit is positively correlated with the output signal of the voltage regulating module 1, so when the output voltage of the linear voltage stabilizing circuit decreases, the sampling signal output by the differential sampling module 3 will decrease, and the output signal of the voltage regulating module 1 will increase, so as to increase the output voltage of the linear voltage stabilizing circuit, and when the output voltage of the linear voltage stabilizing circuit increases, the sampling signal output by the differential sampling module 3 will increase, and the output signal of the voltage regulating module 1 will decrease, so as to decrease the output voltage of the linear voltage stabilizing circuit, that is, even if the output voltage of the linear voltage stabilizing circuit fluctuates, the present application can also stabilize and regulate the linear voltage stabilizing circuit through cooperation of the differential sampling module 3, the voltage regulating module 1 and the compensation module 2.

[0054] As can be seen from the above, the linear voltage stabilizing circuit provided by the present application can improve the sampling precision of the output voltage and eliminate the interference of common-mode signals by using the differential sampling module 3 to differentially sample the output voltage, so the present application can effectively avoid the output fluctuation caused by using a resistor alone for voltage division sampling, thereby effectively improving the accuracy of the output voltage of the linear voltage stabilizing circuit, and the present application can further improve the accuracy of the output voltage of the linear voltage stabilizing circuit by real-time fine adjustment of the output voltage of the linear voltage stabilizing circuit through cooperation of the differential sampling module 3, the voltage regulating module 1 and the compensation module 2.

[0055] In a second aspect, the present application further provides an integrated circuit chip, which comprises the linear voltage stabilizing circuit provided in the first aspect.

[0056] The embodiment of the present application provides an integrated circuit chip, which comprises the linear voltage stabilizing circuit provided in the first aspect, and the principle of the integrated circuit chip provided in the embodiment is the same as that of the linear voltage stabilizing circuit provided in the first aspect, which will not be discussed here in detail.

[0057] As can be seen from the above, the linear voltage stabilizing circuit and the integrated circuit chip provided by the present application can improve the sampling precision of the output voltage and eliminate the interference of common-mode signals by using the differential sampling module 3 to differentially sample the output voltage, so the present application can effectively avoid the output fluctuation caused by using a resistor alone for voltage division sampling, thereby effectively improving the accuracy of the output voltage of the linear voltage stabilizing circuit, and the present application can further improve the accuracy of the output voltage of the linear voltage stabilizing circuit by real-time fine adjustment of the output voltage of the linear voltage stabilizing circuit through cooperation of the differential sampling module 3, the voltage regulating module 1 and the compensation module 2.

[0058] In the embodiments provided in the present application, it should be understood that, in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or sequence between the entities or operations.

[0059] The above only describes the embodiments of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A linear voltage stabilizing circuit, characterized in that: The linear voltage stabilizing circuit comprises: a voltage regulating module, an input terminal of which is connected to the voltage input terminal; a compensation module connected to the output end of the voltage regulation module and the voltage input end, wherein the output end of the compensation module is a voltage output end, and is used to compensate the output voltage by changing the output current; a differential sampling module, whose input end is connected to the voltage output end, and whose output end is connected to the input end of the voltage regulation module, for sampling and amplifying the change of the output voltage to output a sampling signal; The voltage regulating module is used to adjust the upper limit of the output voltage according to the input voltage and to adjust the output voltage according to the sampling signal output by the differential sampling module; The differential sampling module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a capacitor, and a first operational amplifier, one end of the first resistor is connected to the voltage output end, the other end of the first resistor is respectively connected to one end of the second resistor, one end of the capacitor, one end of the third resistor, and one end of the fourth resistor, one end of the sixth resistor is respectively connected to the other end of the second resistor, the other end of the third resistor, the other end of the capacitor, and a ground end, the other end of the fourth resistor is respectively connected to one end of the fifth resistor and a non-inverting input end of the first operational amplifier, the other end of the fifth resistor is connected to the ground end, the other end of the sixth resistor is respectively connected to the inverting input end of the first operational amplifier and one end of the seventh resistor, the other end of the seventh resistor is connected to the output end of the first operational amplifier, the output end of the first operational amplifier is the output end of the differential sampling module, and the phase difference between the input signal of the non-inverting input end of the first operational amplifier and the input signal of the inverting input end of the first operational amplifier is 180°; The voltage regulation module includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a second operational amplifier, one end of the eighth resistor is connected to the voltage input end, the other end of the eighth resistor is respectively connected to one end of the ninth resistor and one end of the tenth resistor, the other end of the ninth resistor is connected to the ground end, the other end of the tenth resistor is respectively connected to the non-inverting input end of the second operational amplifier and one end of the thirteenth resistor, one end of the eleventh resistor is connected to the output end of the differential sampling module, the other end of the eleventh resistor is respectively connected to one end of the twelfth resistor and the inverting input end of the second operational amplifier, the other end of the twelfth resistor is connected to the ground end, and the other end of the thirteenth resistor is respectively connected to the output end of the second operational amplifier and the compensation module.

2. The linear voltage stabilizing circuit according to claim 1, wherein: The resistance value of the fourth resistor is the same as the resistance value of the sixth resistor, and the resistance value of the fifth resistor is the same as the resistance value of the seventh resistor.

3. The linear voltage stabilizing circuit according to claim 1, wherein: The resistance value of the tenth resistor is the same as the resistance value of the eleventh resistor, and the resistance value of the twelfth resistor is the same as the resistance value of the thirteenth resistor.

4. The linear voltage stabilizing circuit according to claim 1, wherein: The compensation module includes a third operational amplifier, a fourteenth resistor and a transistor, the non-inverting input terminal of the third operational amplifier is connected to the voltage regulation module, the inverting input terminal of the third operational amplifier is respectively connected to the emitter of the transistor and the voltage output terminal, the output terminal of the third operational amplifier is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to the base of the transistor, and the collector of the transistor is connected to the voltage input terminal.

5. The linear voltage stabilizing circuit according to claim 4, characterized in that: The compensation module further includes a sliding rheostat, which is respectively connected to the emitter of the transistor, the inverting input terminal of the third operational amplifier, and the voltage output terminal.

6. The linear voltage stabilizing circuit according to claim 5, characterized in that: The sliding resistor includes a first sliding resistor and a second sliding resistor, the sum of the resistance values ​​of the first sliding resistor and the second sliding resistor is a fixed value, one end of the first sliding resistor is connected to the emitter of the transistor, the other end of the first sliding resistor is respectively connected to the inverting input terminal of the third operational amplifier and one end of the second sliding resistor, and the other end of the second sliding resistor is connected to the voltage output terminal.

7. The linear voltage stabilizing circuit according to claim 4, wherein: The transistor is an NPN transistor.

8. An integrated circuit chip, characterized in that: The integrated circuit chip includes the linear voltage regulator circuit according to any one of claims 1 to 7.

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