Linear voltage stabilizing circuit and integrated circuit chip

Abstract

The invention 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 regulation module, the input end of which is connected with a voltage input end; the compensation module is connected with the output end of the voltage regulation module and the voltage input end, the output end of the compensation module is a voltage output end, and the compensation module is used for compensating the output voltage by changing the output current; the input end of the differential sampling module is connected with the voltage output end, the output end of the differential sampling module is connected with the input end of the voltage regulation module, and the differential sampling module is used for sampling and amplifying the change of the output voltage to output a sampling signal; the voltage adjusting 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; according to the linear voltage stabilizing circuit, the situation that output fluctuates due to the fact that a resistor is independently used for voltage division sampling can be effectively avoided, and therefore the accuracy of the output voltage of the linear voltage stabilizing circuit is effectively improved.

Description

Technical Field

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

[0002] In order to make the integrated circuit chip work stably and reliably, the related technology needs to use a linear voltage regulator circuit to provide a stable and smooth voltage. The related linear voltage regulator circuit is configured to adjust the output voltage by using resistors alone for voltage division sampling. Since the resistance value of the resistor is a fixed value, the signal obtained after using resistors alone for voltage division is small, that is, the sampling accuracy of using resistors alone for voltage division sampling may be insufficient, and using resistors alone for voltage division sampling cannot eliminate the interference of common-mode signals. Therefore, using resistors alone for voltage division sampling may cause output fluctuations, resulting in the output voltage of the linear voltage regulator circuit being inaccurate.

[0003] There is no effective technical solution to the above problems. It should be noted that the above information disclosed in this section is only used to understand the background of the present invention, and therefore may contain information that does not constitute prior art. Summary of the invention

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

[0005] In a first aspect, the present application provides a linear voltage stabilization circuit, which includes: A voltage regulating module, whose input terminal is connected to the voltage input terminal; A compensation module is connected to the output terminal and the voltage input terminal of the voltage regulation module, and its output terminal is a voltage output terminal, which 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 regulating module, is used to sample and amplify the change of the output voltage to output a sampling signal; The voltage regulating module is used to adjust the upper limit value 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.

[0006] A linear voltage stabilization circuit provided by the present application can improve the sampling accuracy of the output voltage and eliminate the interference of the common-mode signal by using a differential sampling module 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 stabilization circuit. The present application can also perform real-time fine-tuning on the output voltage of the linear voltage stabilization circuit through the cooperation of a differential sampling module, a voltage regulation module and a compensation module, thereby further improving the accuracy of the output voltage of the linear voltage stabilization circuit.

[0007] Optionally, 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 the ground end, the other end of the fourth resistor is respectively connected to one end of the fifth resistor and the 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°.

[0008] Optionally, 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.

[0009] Optionally, 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 terminal, 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 terminal, the other end of the tenth resistor is respectively connected to the in-phase input terminal of the second operational amplifier and one end of the thirteenth resistor, one end of the eleventh resistor is connected to the output terminal 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 terminal of the second operational amplifier, the other end of the twelfth resistor is connected to the ground terminal, and the other end of the thirteenth resistor is respectively connected to the output terminal of the second operational amplifier and the compensation module.

[0010] Optionally, 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.

[0011] Optionally, 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 and voltage output terminal of the transistor, 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.

[0012] Optionally, the compensation module further includes a sliding resistor, which is respectively connected to the emitter of the transistor, the inverting input terminal and the voltage output terminal of the third operational amplifier.

[0013] When the size of the load changes, the prior art needs to compensate for the output voltage of the linear voltage regulator circuit by adjusting the size of the input voltage. Since the compensation module of the technical solution also includes a sliding rheostat, the sliding rheostat is respectively connected to the emitter of the transistor, the inverting input terminal and the voltage output terminal of the third operational amplifier. Therefore, the technical solution can compensate for the output voltage of the linear voltage regulator circuit by adjusting the resistance value of the sliding rheostat. That is, when the size of the load changes, the technical solution only needs to adjust the resistance value of the sliding rheostat without adjusting the size of the input voltage, thereby effectively improving the convenience of compensating the output voltage of the linear voltage regulator circuit.

[0014] Optionally, 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.

[0015] Optionally, the transistor is an NPN transistor.

[0016] The transistor of this technical solution is an NPN transistor. Since the NPN transistor has the advantages of small size and high reliability, this technical solution can effectively reduce the size of the compensation module and improve the reliability of the compensation module.

[0017] In a second aspect, the present application further provides an integrated circuit chip, which includes a linear voltage regulator circuit provided in the first aspect above.

[0018] An integrated circuit chip provided by the present application can improve the sampling accuracy of the output voltage and eliminate the interference of the common-mode signal by using a differential sampling module 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. The present application can also perform real-time fine-tuning on the output voltage of the linear voltage regulator circuit through the cooperation of the differential sampling module, the voltage regulation module and the compensation module, thereby further improving the accuracy of the output voltage of the linear voltage regulator circuit.

[0019] As can be seen from the above, the linear voltage stabilization circuit and integrated circuit chip provided by the present application can improve the sampling accuracy of the output voltage and eliminate the interference of the common-mode signal by using a differential sampling module 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 stabilization circuit, and the present application can perform real-time fine-tuning on the output voltage of the linear voltage stabilization circuit through the cooperation of the differential sampling module, the voltage regulation module and the compensation module, thereby further improving the accuracy of the output voltage of the linear voltage stabilization circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A circuit diagram of a linear voltage stabilization circuit provided in an embodiment of the present application.

[0021] Figure symbols: 1. voltage regulation 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 sliding resistor; R16. second sliding 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. transistor. DETAILED DESCRIPTION

[0022] 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 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 claimed 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 belong to the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and 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 cannot be understood as indicating or implying relative importance.

[0024] First, as Figure 1 As shown, the present application provides a linear voltage stabilization circuit, which includes: A voltage regulating module 1, whose input terminal is connected to a voltage input terminal VIN; 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 a voltage output terminal VOUT, which is used to compensate the output voltage by changing the output current; A differential sampling module 3, whose input end is connected to the voltage output end VOUT, and whose output end is connected to the input end of the voltage regulating module 1, is used to sample and amplify the change of the output voltage to output a sampling signal; The voltage regulating module 1 is used to adjust the upper limit value 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 3 .

[0025] The linear voltage stabilizing circuit provided in this 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 this embodiment is connected to 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 of the output voltage according to the input voltage and adjust the output voltage according to the sampling signal output by the differential sampling module 3 in a state with a higher input voltage. Since the input end of the compensation module 2 of this embodiment is connected to the output end of the voltage regulating module 1, and the output end of the compensation module 2 is the voltage output end VOUT, this 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 regulator circuit by limiting the upper limit of the output voltage by the voltage regulating module 1, and the voltage regulating module 1 of this embodiment can play the role of protecting the circuit and adjusting the voltage range, so this embodiment can effectively avoid the situation of voltage soaring due to abnormal linear voltage regulator circuit. Specifically, the voltage regulating module 1 of this embodiment can be an analog circuit, which can be composed of an operational amplifier and an adjustable resistor network. The voltage regulating module 1 of this embodiment can also be a digital control circuit, which can realize accurate adjustment of the output voltage through a microcontroller and a digital potentiometer. The compensation module 2 of this embodiment can compensate the output voltage in real time by changing the output current. The input end of the differential sampling module 3 of this embodiment is connected to the voltage output end VOUT. The differential sampling module 3 is used to sample and amplify the change of the output voltage to output a sampling signal, that is, this embodiment is equivalent to using the differential sampling module 3 to perform differential sampling on the output voltage. Compared with using resistors alone for voltage division sampling, differential sampling can more accurately sample the change of voltage and amplify the change in proportion, that is, compared with the prior art, this embodiment can effectively increase the signal obtained after voltage division sampling, that is, the sampling accuracy of the differential sampling module 3 of this embodiment is greater than the sampling accuracy of using resistors alone for voltage division sampling in the prior art, and differential sampling has anti-interference, that is, the differential sampling module 3 of this embodiment can eliminate the interference of common-mode signals, so this embodiment can avoid the situation of output fluctuation by using the differential sampling module 3 to perform differential sampling on the output voltage, thereby avoiding the situation that the output voltage of the linear voltage regulator circuit is not accurate enough due to output fluctuation, that is, this embodiment can effectively improve the accuracy of the output voltage of the linear voltage regulator circuit. Preferably, the voltage output terminal VOUT of the linear voltage stabilizing circuit of this embodiment is connected to a load, and the load is preferably a fifteenth resistor R17, and both ends of the fifteenth resistor R17 are respectively connected to the voltage output terminal VOUT and the ground terminal.

[0026] A linear voltage stabilization circuit provided in the present application can improve the sampling accuracy of the output voltage and eliminate the interference of the common-mode signal 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 stabilization circuit. The present application can perform real-time fine-tuning on the output voltage of the linear voltage stabilization circuit 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 stabilization circuit.

[0027] 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 R4 is respectively connected to 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 stabilization 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); Wherein, V1 represents the sampling signal output 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 regulator circuit.

[0028] 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 in this embodiment 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, the sampling signal output by the differential sampling module 3 in this embodiment is shown in formula (2): (2).

[0029] In some preferred embodiments, the voltage regulating module 1 includes 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 to the voltage input terminal VIN, the other end of the eighth resistor R8 is respectively connected to one end of the ninth resistor R9 and one end of the tenth resistor R10, the other end of the ninth resistor R9 is connected to the ground terminal, the other end of the tenth resistor R10 is respectively connected to the in-phase input terminal of the second operational amplifier AMP2 and one end of the thirteenth resistor R13, one end of the eleventh resistor R11 is connected to the output terminal of the differential sampling module 3, the other end of the eleventh resistor R11 is respectively connected to one end of the twelfth resistor R12 and the inverting input terminal of the second operational amplifier AMP2, the other end of the twelfth resistor R12 is connected to the ground terminal, and the other end of the thirteenth resistor R13 is respectively connected to the output terminal of the second operational amplifier AMP2 and the compensation module 2. The eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 of this embodiment cooperate to form a voltage-dividing network, which can divide the input voltage so that the in-phase input terminal of the second operational amplifier AMP2 receives the voltage signal after voltage division, and the sampling signal output by the differential sampling module 3 is input 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 according to the in-phase 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 achieve 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 shown in formula (3): (3); Wherein, V2 represents the voltage signal between the eighth resistor R8 and the ninth resistor R9, V inrepresents the input voltage, r8 represents the resistance value of the eighth resistor R8, and r9 represents the resistance value of the ninth resistor R9; The output signal of the voltage regulation module 1 of this embodiment is shown in formula (4): (4); Wherein, V3 represents the output signal of the voltage regulation module 1, r 10 represents the resistance value of the tenth resistor R10, r 11 represents the resistance value of the eleventh resistor R11, r 12 represents the resistance value of the twelfth resistor R12, r 13 represents the resistance value of the thirteenth resistor R13.

[0030] In some preferred embodiments, the resistance of the tenth resistor R10 is the same as the resistance of the eleventh resistor R11, and the resistance of the twelfth resistor R12 is the same as the resistance of the thirteenth resistor R13. Since the resistance of the tenth resistor R10 of this embodiment is the same as the resistance of the eleventh resistor R11, and the resistance of the twelfth resistor R12 is the same as the resistance of the thirteenth resistor R13, the output signal of the voltage regulating module 1 of this embodiment is as shown in formula (5): (5).

[0031] In some preferred embodiments, the compensation module 2 includes a third operational amplifier AMP3, a fourteenth resistor R14 and a transistor BJT, the in-phase input terminal of the third operational amplifier AMP3 is connected to the voltage regulation module 1, the inverting input terminal of the third operational amplifier AMP3 is respectively connected to the emitter and the voltage output terminal VOUT of the transistor BJT, the output terminal of the third operational amplifier AMP3 is connected to one end of the fourteenth resistor R14, the other end of the fourteenth 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 regulator 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 regulator circuit.

[0032] In some preferred embodiments, the compensation module 2 further includes a sliding rheostat, which is respectively connected to the emitter of the transistor BJT, the inverting input terminal of the third operational amplifier AMP3, and the voltage output terminal VOUT. The stability of the output voltage of the linear voltage regulator circuit will be affected by the change in load size. When the load size changes, the prior art needs to compensate the output voltage of the linear voltage regulator circuit by adjusting the input voltage. Since the compensation module 2 of this embodiment further includes a sliding rheostat, which is respectively connected to the emitter of the transistor BJT, the inverting input terminal of the third operational amplifier AMP3, and the voltage output terminal VOUT, this embodiment can compensate the output voltage of the linear voltage regulator circuit by adjusting the resistance value of the sliding rheostat, that is, when the load size changes, this embodiment only needs to adjust the resistance value of the sliding rheostat without adjusting the input voltage, thereby effectively improving the convenience of compensating the output voltage of the linear voltage regulator circuit.

[0033] In some preferred embodiments, the sliding resistor includes a first sliding resistor R15 and a second sliding resistor R16, the sum of the resistance of the first sliding resistor R15 and the resistance of the second sliding resistor R16 is a fixed value, one end of the first sliding resistor R15 is connected to the emitter of the transistor BJT, the other end of the first sliding resistor R15 is respectively connected to the inverting input end of the third operational amplifier AMP3 and one end of the second sliding resistor R16, and the other end of the second sliding resistor R16 is connected to the voltage output end VOUT. It should be understood that since the third operational amplifier AMP3 of this embodiment has a virtual short characteristic, that is, the voltage at the non-inverting input end of the third operational amplifier AMP3 is equal to the voltage at the inverting input end of the third operational amplifier AMP3, the output voltage of the linear voltage regulator circuit of this embodiment is as shown in formula (6): (6); Among them, V out represents the output voltage of the linear voltage regulator circuit, r represents the resistance of the load, and r 16 Indicates the resistance value of the second sliding resistor R16.

[0034] In some preferred embodiments, the transistor BJT is an NPN transistor. The transistor BJT in this embodiment is an NPN transistor. Since the NPN transistor has the advantages of small size and high reliability, this embodiment can effectively reduce the size of the compensation module 2 and improve the reliability of the compensation module 2.

[0035] It should be understood that, from formula (2), it can be seen that the sampling signal output by the differential sampling module 3 is positively correlated with the output voltage of the linear voltage regulator circuit. From formula (5), it can be seen that the output signal of the voltage regulation module 1 is negatively correlated with the sampling signal output by the differential sampling module 3. From formula (6), it can be seen that the output voltage of the linear voltage regulator circuit is positively correlated with the output signal of the voltage regulation module 1. Therefore, when the output voltage of the linear voltage regulator circuit decreases, the sampling signal output by the differential sampling module 3 will decrease, and the output signal of the voltage regulation module 1 will increase, so that the output voltage of the linear voltage regulator circuit increases. When the output voltage of the linear voltage regulator circuit increases, the sampling signal output by the differential sampling module 3 will increase, and the output signal of the voltage regulation module 1 will decrease, so that the output voltage of the linear voltage regulator circuit decreases. That is, even if the output voltage of the linear voltage regulator circuit fluctuates, the present application can regulate the linear voltage regulator circuit through the cooperation of the differential sampling module 3, the voltage regulation module 1 and the compensation module 2.

[0036] From the above, it can be seen that the linear voltage stabilization circuit provided by the present application can improve the sampling accuracy of the output voltage and eliminate the interference of the common-mode signal by using the 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 stabilization circuit, and the present application can perform real-time fine-tuning on the output voltage of the linear voltage stabilization circuit 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 stabilization circuit.

[0037] In a second aspect, the present application further provides an integrated circuit chip, which includes a linear voltage regulator circuit provided in the first aspect above.

[0038] An embodiment of the present application provides an integrated circuit chip, which includes a linear voltage regulator circuit provided by the first aspect. The principle of the integrated circuit chip provided by the embodiment is the same as the principle of the linear voltage regulator circuit provided by the first aspect, and will not be discussed in detail here.

[0039] As can be seen from the above, the linear voltage stabilization circuit and integrated circuit chip provided by the present application can improve the sampling accuracy of the output voltage and eliminate the interference of the common-mode signal by using the 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 stabilization circuit, and the present application can perform real-time fine-tuning on the output voltage of the linear voltage stabilization circuit 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 stabilization circuit.

[0040] In the embodiments provided in the present application, it should be understood that, herein, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0041] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made 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 stabilization circuit comprises: A voltage regulating module, whose input terminal is connected to the voltage input terminal; A compensation module, connected to the output end of the voltage regulating module and the voltage input end, wherein the output end 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 regulating module, is used to sample and amplify the change of the output voltage to output a sampling signal; The voltage regulating module is used to adjust the upper limit value 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.

2. The linear voltage stabilizing circuit according to claim 1, characterized in that: 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 the ground end, the other end of the fourth resistor is respectively connected to one end of the fifth resistor and the 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°.

3. The linear voltage stabilizing circuit according to claim 2, characterized in that: 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.

4. The linear voltage stabilizing circuit according to claim 1, characterized in that: The voltage regulating 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 in-phase 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.

5. The linear voltage stabilizing circuit according to claim 4, characterized in that: 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.

6. The linear voltage stabilizing circuit according to claim 1, characterized in that: 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.

7. The linear voltage stabilizing circuit according to claim 6, characterized in that: The compensation module further includes a sliding resistor, which is respectively connected to the emitter of the transistor, the inverting input terminal of the third operational amplifier and the voltage output terminal.

8. The linear voltage stabilizing circuit according to claim 7, 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 end 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 end.

9. The linear voltage stabilizing circuit according to claim 6, characterized in that: The transistor is an NPN transistor.

10. An integrated circuit chip, characterized in that: The integrated circuit chip comprises the linear voltage regulator circuit as described in any one of claims 1-9.

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