Linear voltage stabilizing circuit and voltage stabilizing control method

Abstract

The invention discloses a linear voltage stabilizing circuit and a voltage stabilizing control method. The linear voltage stabilizing circuit comprises a voltage adjusting module, an error amplifying module and a voltage generating module. The voltage adjusting module is used for determining a second reference voltage according to the detection value and the first reference voltage; the error amplification module is used for receiving second reference voltage; the output end of the error amplification module is used for outputting control voltage; the voltage generation module is used for generating output voltage according to the control voltage; the error amplification module is used for generating control voltage according to the second reference voltage and the output voltage; the voltage adjusting module is also used for determining a reference voltage range according to the first reference voltage; and determining a detection value according to the output voltage and the reference voltage range. The change of the output voltage is directly fed back to the error amplification module, the change of the output voltage is further fed back to the error amplification module by adjusting the second reference voltage, the change of the output voltage is quickly responded through a dual feedback path, and the performance of the linear voltage stabilizing circuit is remarkably optimized.

Description

Technical Field

[0001] This application relates to the field of voltage regulator circuit technology, and more specifically, to a linear voltage regulator circuit and a voltage regulation control method. Background Technology

[0002] Linear voltage regulators can provide stable and low-noise power supply voltages, playing an important role in applications requiring low noise and fast response.

[0003] With the rapid development of controller technology, high-performance controllers are becoming more and more precise and the signal speed is getting faster and faster, which puts forward higher requirements for the performance of linear voltage regulator circuits.

[0004] In related technologies, the output voltage is directly fed back to the error amplification module to adjust for changes in the output voltage. However, due to the physical characteristics of the devices, there is an upper limit to the optimization of their response speed and accuracy, making it difficult to further improve the performance of linear voltage regulator circuits. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a linear voltage regulator circuit and a voltage regulation control method.

[0006] In a first aspect, embodiments of this application provide a linear voltage regulator circuit, comprising: a voltage adjustment module, an error amplification module, and a voltage generation module; wherein, the voltage adjustment module is used to determine a second reference voltage based on a detected value and a first reference voltage; the first input terminal of the error amplification module is used to receive the second reference voltage; the output terminal of the error amplification module is used to output a control voltage; the voltage generation module is used to generate an output voltage based on the control voltage; wherein, the second input terminal of the error amplification module is used to receive the output voltage; the error amplification module is used to generate a control voltage based on the second reference voltage and the output voltage; the voltage adjustment module is further used to determine a reference voltage range based on the first reference voltage; and to determine a detected value based on the output voltage and the reference voltage range.

[0007] Secondly, embodiments of this application also provide a voltage regulation control method applied to the linear voltage regulator circuit described in the first aspect above. The method includes: determining a reference voltage range based on a received first reference voltage; determining a detection value based on an output voltage and the reference voltage range; determining a second reference voltage based on the detection value and the first reference voltage; generating a control voltage based on the second reference voltage and the output voltage; and generating an output voltage based on the control voltage.

[0008] The technical solution provided by this invention includes a linear voltage regulator circuit comprising: a voltage adjustment module, an error amplification module, and a voltage generation module. The voltage adjustment module determines a second reference voltage based on a detected value and a first reference voltage. The first input terminal of the error amplification module receives the second reference voltage. The output terminal of the error amplification module outputs a control voltage. The voltage generation module generates an output voltage based on the control voltage. The second input terminal of the error amplification module receives the output voltage. The error amplification module generates the control voltage based on the second reference voltage and the output voltage. The voltage adjustment module also determines a reference voltage range based on the first reference voltage and determines a detected value based on the output voltage and the reference voltage range. On one hand, changes in the output voltage are directly fed back to the second input terminal of the error amplification module. On the other hand, changes in the output voltage are also fed back to the first input terminal of the error amplification module through adjustment of the second reference voltage. By employing a dual feedback path, the circuit can quickly respond to changes in output voltage, thereby significantly optimizing the performance of the linear voltage regulator circuit. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments and drawings obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0010] Figure 1 A schematic diagram of a linear voltage regulator circuit provided in the embodiments of this application is shown.

[0011] Figure 2 It shows Figure 1 A schematic diagram of the load regulation of a linear voltage regulator circuit.

[0012] Figure 3 It shows Figure 1 A schematic diagram of the linear regulation rate of a medium-linear voltage regulator circuit.

[0013] Figure 4 It shows Figure 1 A schematic diagram of the temperature regulation rate of a linear voltage regulator circuit.

[0014] Figure 5 A schematic diagram of a linear voltage regulator circuit provided in an embodiment of this application is shown.

[0015] Figure 6 A schematic diagram of the structure of a voltage adjustment module provided in an embodiment of this application is shown.

[0016] Figure 7A schematic diagram of the structure of a first range determination unit provided in an embodiment of this application is shown.

[0017] Figure 8 A schematic diagram of the structure of a first error detection unit provided in an embodiment of this application is shown.

[0018] Figure 9 A schematic diagram of the structure of a first voltage adjustment unit provided in an embodiment of this application is shown.

[0019] Figure 10 A flowchart illustrating the adjustment process of a logic subunit provided in an embodiment of this application is shown.

[0020] Figure 11 A flowchart illustrating the adjustment of another logic subunit provided in an embodiment of this application is shown.

[0021] Figure 12 A schematic diagram of another voltage adjustment module provided in an embodiment of this application is shown.

[0022] Figure 13 A schematic diagram of a voltage generation module provided in an embodiment of this application is shown.

[0023] Figure 14 A schematic diagram of another voltage generation module provided in an embodiment of this application is shown.

[0024] Figure 15 A schematic flowchart of a voltage regulation control method provided in an embodiment of this application is shown. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0026] Terminology Explanation In the embodiments of this application, the low-dropout regulator (LDO), also known as a low-dropout linear regulator or low-voltage-drop regulator, is a type of linear DC regulator that can provide a stable DC voltage power supply.

[0027] In the embodiments of this application, the bandgap voltage reference circuit achieves a temperature-independent voltage reference by using the sum of a voltage with a positive temperature coefficient and a voltage with a negative temperature coefficient, whose temperature coefficients cancel each other out.

[0028] In the embodiments of this application, an error amplifier (EA) is an electronic device that can be used to amplify an "error" signal. The error amplifier detects the minute difference (i.e., error) between the input signal and the reference signal and amplifies it with high precision so that subsequent circuits can make accurate adjustments and corrections accordingly.

[0029] In the embodiments of this application, load regulation refers to the ability of a linear voltage regulator circuit to maintain a stable output voltage when the output current of the load changes. In the embodiments of this application, the linear regulation rate refers to the ability of a linear voltage regulator circuit to maintain a stable output voltage when the input voltage changes.

[0030] In the embodiments of this application, the temperature regulation rate refers to the ability of a linear voltage regulator circuit to maintain a stable output voltage when the ambient temperature changes.

[0031] In the embodiments of this application, the OTA (Operational Transconduct Amplifier) ​​amplifier is an amplifier that converts the input differential voltage into the output current, and is a voltage-controlled current source (VCCS).

[0032] In the embodiments of this application, the folded cascode amplifier is a high-performance analog integrated circuit amplifier that can "fold" the current signal of the input transistor (cascode configuration) through a parallel constant current source, so that the signal path is switched from the same branch to another parallel branch, and then fed into the output stage of the cascode configuration.

[0033] In the embodiments of this application, a cascade amplifier refers to a horizontally cascaded amplifier, which means connecting multiple amplifiers or circuit units sequentially in input-to-output order. The output of each amplifier is directly connected to the input of the next amplifier.

[0034] In the embodiments of this application, a digital-to-analog converter (DAC) is a circuit that converts a numerical code value into an analog level of different voltages. The output analog voltage value is generally determined by a reference voltage and an n-bit input numerical code value (data), and the output voltage Vout = reference voltage × (data / 2). n ).

[0035] In the embodiments of this application, LSB (Least Significant Bit) is the smallest output increment in a digital-to-analog converter (DAC), that is, the smallest voltage change that the DAC can generate. For a DAC with n-bit resolution of the input reference voltage, 1 LSB = reference voltage / 2. n .

[0036] In the embodiments of this application, a finite state machine (FSM) is a numerical logic circuit that can realize a mathematical model of the response to external events in different states.

[0037] In embodiments of this application, the R-2R DAC (R-2R Resistor Ladder Digital-to-Analog Converter) utilizes a precision resistor network (typically with only two resistance values: R and 2R) to convert digital signals into analog voltages or currents.

[0038] In the embodiments of this application, the resistor-string DAC (Resistor-String Digital-to-Analog Converter) is a voltage divider network consisting of a large number of resistors with the same resistance value connected in series. Through a multiplexer (such as an analog switch tree or decoder) controlled by digital input code, a corresponding voltage is selected from each node of the voltage divider as the analog output.

[0039] In the embodiments of this application, a current-steering digital-to-analog converter (DAC) is a circuit that achieves digital-to-analog conversion by controlling a constant current source array precisely controlled by digital code to direct current to different output paths.

[0040] In this application, a multi-bit adder / subtractor is a digital logic circuit capable of performing addition or subtraction operations on two multi-bit wide binary numbers, and the control signal can determine whether an addition or subtraction operation is currently being performed.

[0041] Linear voltage regulators can convert unstable input power sources (such as those from batteries, solar panels, energy harvesters, etc.) into stable output power. In addition, when there is noise in the input power supply, linear voltage regulators can also suppress the noise of the input power supply and produce a low-noise output power supply.

[0042] Because linear voltage regulators can provide stable and low-noise power supply voltages, they play an important role in applications requiring low noise and fast response.

[0043] With the rapid development of controller technology, high-performance controllers are becoming more and more precise and the signal speed is getting faster and faster, which puts forward higher requirements for the performance of linear voltage regulator circuits.

[0044] In related technologies, the output voltage is directly fed back to the error amplification module to adjust for changes in the output voltage.

[0045] Figure 1 A schematic diagram of a linear voltage regulator circuit in the related art is shown, such as... Figure 1 As shown, the linear voltage regulator circuit 100 includes a reference voltage generation module 110, an error amplification module 120, and a voltage generation module 130.

[0046] The reference voltage generation module 110 can be a bandgap reference circuit. The input voltage Vin provided by the input power supply Battery is input to the reference voltage generation module 110, and the reference voltage generation module 110 can generate a reference voltage Vref with extremely low process / voltage / temperature variation coefficient.

[0047] The error amplification module 120 may include an error amplifier, the negative input of which is used to receive a reference voltage Vref, and the output of which is connected to the voltage generation module 130.

[0048] The voltage generation module 130 can generate an output voltage Vout to provide a stable power supply for the load, and generate a load current ILoad when the load is working.

[0049] The voltage generation module 130 includes a PMOS (Positive channel Metal Oxide Semiconductor) power transistor, a load, and a capacitor.

[0050] The gate of the PMOS power transistor is connected to the output of the error amplifier module 120. The voltage generation module 130 feeds back the generated output voltage Vout to the positive input of the error amplifier, thereby stabilizing the value of the output voltage Vout to the reference voltage Vref through negative feedback.

[0051] With the development of controller technology and the increase in signal speed, the requirements for stable and low-noise power supplies are becoming increasingly stringent, placing higher performance demands on linear voltage regulator circuits.

[0052] Figure 2 It shows Figure 1 A schematic diagram of the load regulation rate of a linear voltage regulator circuit; Figure 3 It shows Figure 1 A schematic diagram of the linear regulation rate of a medium-linear voltage regulator circuit; Figure 4 It shows Figure 1 A schematic diagram of the temperature regulation rate of a linear voltage regulator circuit. Although... Figure 1 The linear voltage regulator circuit shown can achieve a stable output, but in actual use, such as... Figure 2-4 As shown, if the load current ILoad, input voltage Vin, or ambient temperature Temp changes (e.g., the load current I...), load Deviation from current reference value TYP I load When the input voltage Vin deviates from the voltage reference value TYP Vin and the ambient temperature Temp deviates from the temperature reference value TYPTemp, the output voltage Vout will fluctuate and deviate from the reference voltage Vref.

[0053] Due to the physical characteristics of the devices, such as the presence of fluctuations, the compensation capability of the error amplifier is limited. The size and characteristics of the error amplifier, as well as its gain and bandwidth, all affect the accuracy and speed of compensation, and these are all constrained by semiconductor technology and physical laws. Moreover, the compensation capability of the error amplifier decreases at higher signal frequencies. In addition, the relevant parameters of some components in the linear voltage regulator circuit will also change due to temperature variations.

[0054] In other words, there is an upper limit to the optimization of the response speed and accuracy of linear voltage regulator circuits in related technologies, making it difficult to further improve the performance of linear voltage regulator circuits.

[0055] To address the aforementioned problems, the inventors have proposed a linear voltage regulator circuit and a voltage regulation control method as provided in this application. The linear voltage regulator circuit includes a voltage adjustment module, an error amplification module, and a voltage generation module. The voltage adjustment module determines a second reference voltage based on a detected value and a first reference voltage. The first input terminal of the error amplification module receives the second reference voltage, and the output terminal of the error amplification module outputs a control voltage. The voltage generation module generates an output voltage based on the control voltage. The second input terminal of the error amplification module receives the output voltage and generates the control voltage based on the second reference voltage and the output voltage. The voltage adjustment module also determines a reference voltage range based on the first reference voltage and determines a detected value based on the output voltage and the reference voltage range. On one hand, changes in the output voltage are directly fed back to the second input terminal of the error amplification module. On the other hand, changes in the output voltage are also fed back to the first input terminal of the error amplification module through adjustment of the second reference voltage. By employing a dual feedback path, the circuit can quickly respond to changes in output voltage, thereby significantly optimizing the performance of the linear voltage regulator circuit.

[0056] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0057] Please see Figure 5, Figure 5 A schematic diagram of a linear voltage regulator circuit provided in an embodiment of this application is shown, as follows: Figure 5 As shown, the linear voltage regulator circuit 200 provided in this application embodiment includes: a voltage adjustment module 210, an error amplification module 220, and a voltage generation module 230.

[0058] In the embodiments of this application, the voltage adjustment module 210 is used to receive a first reference voltage Vref1, and the voltage adjustment module 210 is also used to determine a second reference voltage Vref2 based on the detected value and the first reference voltage Vref1.

[0059] The first input terminal of the error amplifier module 220 is used to receive the second reference voltage Vref2; the output terminal of the error amplifier module 220 is used to output the control voltage.

[0060] The voltage generation module 230 is used to receive the control voltage and generate the output voltage Vout based on the control voltage.

[0061] In the embodiments of this application, the control voltage output by the error amplification module 220 will affect the magnitude of the final generated output voltage Vout.

[0062] The first input terminal of the error amplifier module 220 is used to receive the second reference voltage Vref2, and the second input terminal of the error amplifier module 220 is used to receive the output voltage Vout. The error amplifier module 220 is used to generate a control voltage based on the second reference voltage Vref2 and the output voltage Vout. In other words, the control voltage is affected by both the second reference voltage Vref2 and the output voltage Vout.

[0063] In the embodiments of this application, the voltage adjustment module 210 is further configured to receive the output voltage Vout, determine the reference voltage range based on the first reference voltage Vref1, and determine the detection value based on the output voltage Vout and the reference voltage range. The voltage adjustment module 210 determines the second reference voltage Vref2 based on the detection value and the first reference voltage Vref1. That is, the change in the output voltage Vout will affect the value of the detection value, thereby adjusting the second reference voltage Vref2.

[0064] The detected value is used to reflect the relationship between the output voltage Vout and the reference voltage range. There are three possible relationships between the output voltage Vout and the reference voltage range: the first is that the output voltage Vout is within the reference voltage range; the second is that the output voltage Vout is greater than the maximum value of the reference voltage range; and the third is that the output voltage Vout is less than the minimum value of the reference voltage range.

[0065] If the output voltage Vout is determined to be within the reference voltage range by the detected value, the second reference voltage Vref2 is not adjusted, i.e., the value of the second reference voltage Vref2 remains unchanged. If the output voltage Vout is determined to be greater than the maximum value of the reference voltage range by the detected value, the value of the second reference voltage Vref2 is reduced, and the value of the generated control voltage is adjusted to reduce the magnitude of the output voltage Vout. If the output voltage Vout is determined to be less than the minimum value of the reference voltage range by the detected value, the value of the second reference voltage Vref2 is increased, and the value of the generated control voltage is adjusted to increase the magnitude of the output voltage Vout.

[0066] In the embodiments of this application, on the one hand, the output voltage Vout is directly input to the second input terminal of the error amplification module 120 to form negative feedback. When the output voltage Vout changes, the control voltage is adjusted through negative feedback. On the other hand, the magnitude of the second reference voltage Vref2 is adjusted according to the change of the output voltage Vout, thereby adjusting the control voltage. Thus, through the dual feedback path, the output voltage Vout can be responded to quickly when it changes.

[0067] In the embodiments of this application, the voltage adjustment module 210 can be implemented in various ways, such as by analog circuits, digital circuits, controllers, etc., or by one or more combinations of analog circuits, digital circuits, and controllers. The specific implementation can be set according to the needs of the application scenario. This application does not limit this, and will explain it in detail below.

[0068] In some implementations, the voltage adjustment module 210 receives a first reference voltage Vref1, and the value of the first reference voltage Vref1 is used as the initial value of the second reference voltage Vref2.

[0069] In other embodiments, the voltage adjustment module 210 receives a first reference voltage Vref1. For ease of calculation, a reference value can be set, and the initial value of the second reference voltage Vref2 can be determined by the first reference voltage Vref1 and the reference value.

[0070] Optionally, the reference value can be a preset value, in which case the magnitude of the input first reference voltage Vref1 can be selected based on the preset reference value and the magnitude of the initial value of the required second reference voltage Vref2.

[0071] Optionally, the reference value can be set by the user according to the needs of the application scenario and input into the voltage adjustment module 210.

[0072] In the embodiments of this application, after the voltage adjustment module 210 determines the initial value of the second reference voltage Vref2 based on the first reference voltage Vref1, it further determines the reference voltage range based on the initial value of the second reference voltage Vref2.

[0073] The reference voltage range includes the initial value of the second reference voltage Vref2. For example, the initial value of the second reference voltage Vref2 can be used as the intermediate value of the reference voltage range. The size of the reference voltage range can be set according to the control precision required by the application scenario. It is understood that the smaller the reference voltage range, the higher the control precision. The minimum settable reference voltage range varies depending on the specific device used.

[0074] In the embodiments of this application, the voltage adjustment module 210 can receive the output voltage Vout and determine the detection value based on the output voltage Vout and the reference voltage range.

[0075] The detected value is used to reflect the relationship between the output voltage Vout and the reference voltage range. There are three possible relationships between the output voltage Vout and the reference voltage range: the first is that the output voltage Vout is within the reference voltage range; the second is that the output voltage Vout is greater than the maximum value of the reference voltage range; and the third is that the output voltage Vout is less than the minimum value of the reference voltage range.

[0076] Therefore, the detection value also has three different values.

[0077] In some implementations, the voltage adjustment module 210 may include multiple comparators. The output voltage Vout is input to one comparator and compared with the maximum value of the reference voltage range. Based on the output result of the comparator, it is determined whether the output voltage Vout is greater than the maximum value of the reference voltage range. Simultaneously, the output voltage Vout is input to another comparator and compared with the minimum value of the reference voltage range. Based on the output result of the comparator, it is determined whether the output voltage Vout is less than the maximum value of the reference voltage range. The output results of the two comparators can be used as detection values, thereby determining whether the output voltage Vout is greater than the maximum value of the reference voltage range, less than the maximum value of the reference voltage range, or within the reference voltage range.

[0078] In other embodiments, the voltage adjustment module 210 may include an analog-to-digital converter and a controller. The analog-to-digital converter can convert the output voltage Vout into a digital signal and transmit the digital signal to the controller. The controller can determine whether the output voltage Vout is greater than the maximum value of the reference voltage range, less than the maximum value of the reference voltage range, or within the reference voltage range based on the received digital signal, and output the corresponding detection value.

[0079] It is understood that other implementation methods can also be used to compare the output voltage Vout with the reference voltage range and determine the corresponding detection value. For example, a controller specifically designed for voltage comparison can also be used, and this application does not limit this.

[0080] In the embodiments of this application, the specific implementation of generating the reference voltage range varies depending on the electronic devices used.

[0081] In some implementations, if a controller is used for comparison, the controller determines the reference voltage range based on the initial value of the second reference voltage Vref2 through logical operations (specifically referring to the above-described method for determining the reference voltage range).

[0082] In other implementations, if a comparator is used for comparison, it is necessary to generate analog signals of the maximum and minimum values ​​of the reference voltage range based on the first reference voltage, and input the analog signals of the maximum and minimum values ​​of the reference voltage range to the input terminals of the corresponding comparators.

[0083] For example, the maximum value of the reference voltage range can be obtained based on the initial value of the second reference voltage Vref2 through an adder circuit (e.g., an operational amplifier to implement a non-inverting adder circuit, an inverting adder circuit, etc.).

[0084] For example, the minimum value of the reference voltage range can be obtained from the initial value of the second reference voltage Vref2 through a subtraction circuit (e.g., through a differential amplifier).

[0085] In some other implementations, the maximum and minimum values ​​of the reference voltage range can also be generated by a digital-to-analog converter.

[0086] The following will provide a detailed description of the voltage adjustment module 210 provided in the embodiments of this application.

[0087] Please see Figure 6 , Figure 6 This paper shows a schematic diagram of the structure of a voltage adjustment module provided in an embodiment of this application, as shown below. Figure 6 As shown, the voltage adjustment module 210 includes: a first range determination unit 211, a first error detection unit 212, and a first voltage adjustment unit 213.

[0088] The first terminal of the first range determination unit 211 is used to receive the first reference voltage Vref1, the second terminal of the first range determination unit 211 is used to receive the reference value, and the first range determination unit 211 is used to determine the reference voltage range based on the first reference voltage Vref1 and the reference value.

[0089] In embodiments of this application, a reference value can be set for ease of calculation. The initial value of the second reference voltage Vref2 can be determined using the first reference voltage Vref1 and the reference value. For example, the first range determination unit 211 may include a controller, which determines the initial value of the second reference voltage Vref2 based on the first reference voltage Vref1 and the reference value. Alternatively, the first range determination unit 211 may include a digital-to-analog converter (DAC), where the reference value is the input code value of the corresponding DAC. The initial value of the second reference voltage Vref2 can be determined by the DAC based on the first reference voltage Vref1 and the reference value. Assuming the resolution of the DAC is n, the initial value of the second reference voltage Vref2 = first reference voltage Vref1 × (reference value / 2). n Furthermore, the maximum and minimum values ​​of the reference voltage range can be obtained through addition and subtraction circuits. If the initial value of the second reference voltage Vref2 is the midpoint of the reference voltage range, the maximum and minimum values ​​of the reference voltage range can also be directly output by the digital-to-analog converter. It can be understood that the minimum range of the reference voltage range can be determined by the minimum step unit of the digital-to-analog converter, i.e., the minimum range of the reference voltage range is: the initial value of the second reference voltage Vref2 ± 1 LSB. The minimum value of the minimum range of the reference voltage range = the first reference voltage Vref1 × [(reference value - 1) / 2] n The maximum value of the minimum range of the reference voltage range = the first reference voltage Vref1 × [(reference value + 1) / 2] n ].

[0090] In some implementations, the minimum value of the reference voltage range is the lower limit voltage value, and the maximum value of the reference voltage range is the upper limit voltage value.

[0091] Please see Figure 7 , Figure 7 This illustration shows a structural schematic diagram of a first range determination unit provided in an embodiment of this application, as shown below. Figure 7 As shown, the first range determination unit 211 includes a first digital-to-analog converter DAC0. The first input terminal v0 of the first digital-to-analog converter DAC0 is used to receive a first reference voltage Vref1. The second input terminal data1 of the first digital-to-analog converter DAC0 is used to receive a reference value CODE0. The first digital-to-analog converter DAC1 is used to determine an upper limit voltage value VREF_CMP1 and a lower limit voltage value VREF_CMP0 based on the first reference voltage Vref1 and the reference value CODE0. The first output terminal of the first digital-to-analog converter DAC1 is used to output the upper limit voltage value VREF_CMP1, and the second output terminal of the first digital-to-analog converter DAC1 is used to output the lower limit voltage value VREF_CMP0.

[0092] In the embodiments of this application, the first digital-to-analog converter DAC0 can be an R-2R DAC, a resistor string DAC, a current-driven DAC, etc., and there are no restrictions.

[0093] In the embodiments of this application, taking the resolution of the first digital-to-analog converter DAC0 as 8 bits as an example, the range of CODE0 is 0~255. Assuming that the value of CODE0 is 150, then VREF_CMP0 = VREF1 × (CODE0 - 1) / 2 8 ;VREF_CMP1=VREF1×(CODE0+1) / 2 8 .

[0094] It is understood that a digital-to-analog converter with an appropriate resolution can be used as needed, and this application does not impose any restrictions on this.

[0095] In the embodiments of this application, the first error detection unit 212 is used to receive a reference voltage range and an output voltage Vout, and to determine a detection value based on the output voltage Vout and the reference voltage range.

[0096] In some implementations, the first error detection unit 212 may include a controller and an analog-to-digital converter (ADC). The ADC can convert the output voltage Vout and the maximum and minimum values ​​of the reference voltage range into digital signals and input them into the controller, which then determines the detection value.

[0097] In some other embodiments, the first error detection unit 212 may also include a comparator, which determines the detection value based on the output voltage Vout and the reference voltage range.

[0098] The comparator can be a static comparator, a clocked dynamic comparator, etc., and there are no restrictions on this.

[0099] In some implementations, the detected value includes a first comparison value CMP_OUT1 and a second comparison value CMP_OUT0.

[0100] Please see Figure 8 , Figure 8 This paper shows a schematic diagram of the structure of a first error detection unit provided in an embodiment of this application, as shown below. Figure 8 As shown, the error detection unit 212 includes a first comparator CMP1 and a second comparator CMP2.

[0101] Wherein, the first input terminal of the first comparator CMP1 is used to receive the output voltage Vout; the second input terminal of the first comparator CMP1 is used to receive the upper limit voltage value VREF_CMP1; the first comparator CMP1 is used to determine the first comparison value CMP_OUT1 based on the output voltage Vout and the upper limit voltage value VREF_CMP1, and output the first comparison value CMP_OUT1 through the output terminal of the first comparator CMP1.

[0102] The first input terminal of the first comparator CMP1 can be either a positive input terminal or a negative input terminal. If the first input terminal of the first comparator CMP1 is a positive input terminal, then the second input terminal of the first comparator CMP1 is a negative input terminal.

[0103] For example, the first input terminal of the first comparator CMP1 is a positive input terminal, and the second input terminal of the first comparator CMP1 is a negative input terminal. Then, when the output voltage Vout is greater than the upper limit voltage value VREF_CMP1, the first comparison value CMP_OUT1 is high, that is, the first comparison value CMP_OUT1=1.

[0104] The first input terminal of the second comparator CMP2 is used to receive the output voltage Vout; the second input terminal of the second comparator CMP2 is used to receive the lower limit voltage value VREF_CMP0; the second comparator CMP2 is used to determine the second comparison value CMP_OUT0 based on the output voltage Vout and the lower limit voltage value VREF_CMP0, and output the second comparison value CMP_OUT0 through the output terminal of the second comparator CMP2.

[0105] In this circuit, the first input of the second comparator CMP2 can be either a positive or a negative input. If the first input of the second comparator CMP2 is a positive input, then the second input of the second comparator CMP2 is a negative input.

[0106] For example, the first input terminal of the second comparator CMP2 is a positive input terminal, and the second input terminal of the second comparator CMP2 is a negative input terminal. Then, when the output voltage Vout is greater than the lower limit voltage value VREF_CMP2, the second comparison value CMP_OUT0 is high, that is, the second comparison value CMP_OUT0=1.

[0107] Therefore, if the output voltage Vout is within the reference voltage range, then the output voltage Vout is less than the upper limit voltage value VREF_CMP1, and at the same time, the output voltage Vout is greater than the lower limit voltage value VREF_CMP2; then the first comparison value CMP_OUT1=0, and the second comparison value CMP_OUT0=1.

[0108] If the output voltage Vout is greater than the upper limit voltage value VREF_CMP1, then the output voltage Vout must be greater than the lower limit voltage value VREF_CMP2; therefore, the first comparison value CMP_OUT1=1 and the second comparison value CMP_OUT0=1.

[0109] If the output voltage Vout is less than the lower limit voltage value VREF_CMP2, then the output voltage Vout must be less than the upper limit voltage value VREF_CMP1; therefore, the first comparison value CMP_OUT1=0 and the second comparison value CMP_OUT0=0.

[0110] In the embodiments of this application, for ease of calculation, an adjustment value CODE1 can be set. The first voltage adjustment unit 213 is used to update the adjustment value CODE1 according to the detected value, and to determine the second reference voltage Vref2 according to the first reference voltage Vref1 and the adjustment value CODE1.

[0111] Specifically, if the output voltage Vout is determined to be within the reference voltage range based on the detected value, the adjustment value CODE1 remains unchanged, that is, the adjustment value CODE1 of the current detection cycle is equal to the adjustment value CODE1 of the previous detection cycle.

[0112] If the output voltage Vout is determined to be greater than the upper limit voltage value VREF_CMP1 based on the detection value, the adjustment value CODE1 is reduced by a preset unit adjustment amount. That is, the adjustment value CODE1 of the current detection cycle = the adjustment value CODE1 of the previous detection cycle - the preset unit adjustment amount. In this way, by reducing the value of the second reference voltage Vref2, the output voltage Vout is suppressed from rising further, thereby controlling the output voltage Vout within the reference voltage range.

[0113] If the output voltage Vout is determined to be less than the lower limit voltage value VREF_CMP2 based on the detection value, the adjustment value CODE1 is increased by a preset unit adjustment amount. That is, the adjustment value CODE1 of the current detection cycle = the adjustment value CODE1 of the previous detection cycle + the preset unit adjustment amount. In this way, by increasing the value of the second reference voltage Vref2, the output voltage Vout is suppressed from further decreasing, thereby controlling the output voltage Vout within the reference voltage range.

[0114] Please see Figure 9 , Figure 9 A schematic diagram of the structure of a voltage adjustment unit provided in an embodiment of this application is shown, as follows: Figure 9 As shown, the voltage adjustment unit 213 includes a logic subunit FSM and a second digital-to-analog converter DAC1.

[0115] The first input terminal of the logic subunit FSM is used to receive the first comparison value CMP_OUT1, and the second input terminal of the logic subunit FSM is used to receive the second comparison value CMP_OUT0; the logic subunit FSM is used to update the adjustment value CODE1 according to the first comparison value CMP_OUT1 and the second comparison value CMP_OUT0.

[0116] Specifically, the logic subunit FSM assigns the base value CODE0 to the adjustment value CODE1, meaning that the initial value of CODE1 is CODE0.

[0117] For example, the logic subunit FSM determines whether the first comparison value CMP_OUT1 is 0. If the first comparison value CMP_OUT1=1, the logic subunit FSM will update the adjustment value CODE1, that is, the CODE1 of the current detection cycle = the CODE1-1 of the previous detection cycle; and return to the step of determining whether the first comparison value CMP_OUT1 is 0.

[0118] If the first comparison value CMP_OUT1=0, then check if the second comparison value CMP_OUT0 is 1.

[0119] If the second comparison value CMP_OUT0=0, the logic subunit FSM will update the adjustment value CODE1, that is, the CODE1 of the current detection cycle = the CODE1 of the previous detection cycle + 1; and return to the step of determining whether the second comparison value CMP_OUT0 is 1.

[0120] It is understood that this application is not limited to this. In other embodiments, the logic subunit FSM may first determine the case of the second comparison value CMP_OUT0, or the logic subunit FSM may determine whether the first comparison value CMP_OUT1 is 1, or the logic subunit FSM may determine whether the second comparison value CMP_OUT0 is 0. The judgment logic is adjusted accordingly, and no restrictions are imposed here.

[0121] Please refer to Figure 10 , Figure 10 This application provides an embodiment of a flowchart illustrating the adjustment process of a logic subunit, as shown below. Figure 10 As shown, in the initial state, the linear regulator circuit 200 works normally and stably, the adjustment value CODE1 = the reference value CODE0, the output voltage Vout is the expected voltage value, that is, the output voltage Vout is within the preset voltage range, that is, the output voltage Vout is greater than the lower limit voltage value VREF_CMP0 and less than the upper limit voltage value VREF_CMP1, the first comparison value CMP_OUT0 = 1, and the second comparison value CMP_OUT1 = 0.

[0122] Because the load current, input voltage, or temperature at the location of the linear regulator circuit 200 changes (i.e., characteristic changes), the output voltage Vout decreases, meaning the output voltage Vout is less than the lower limit voltage value VREF_CMP0.

[0123] At this time, the first comparison value CMP_OUT0=0, and the logic sub-unit FSM makes the first adjustment (i.e., adjustment 1), that is, the adjustment value CODE1 of the current detection cycle = the adjustment value CODE1 (i.e. CODE0) of the previous detection cycle + 1, thereby the second reference voltage Vref2 rises and the output voltage Vout rises.

[0124] At this time, the output voltage Vout is still less than the lower limit voltage value VREF_CMP0, the first comparison value CMP_OUT0=0, the logic sub-unit FSM makes a second adjustment (i.e. adjustment 2), that is, the adjustment value CODE1 of the current detection cycle = the adjustment value CODE1 of the previous detection cycle (i.e. CODE0+1)+1, so the second reference voltage Vref2 rises, and the output voltage Vout rises.

[0125] At this time, the output voltage Vout is still less than the lower limit voltage value VREF_CMP0, the first comparison value CMP_OUT0=0, the logic sub-unit FSM makes the third adjustment (i.e. adjustment 3), that is, the adjustment value CODE1 of the current detection cycle = the adjustment value CODE1 of the previous detection cycle (i.e. CODE0+2)+1, so the second reference voltage Vref2 rises, and the output voltage Vout rises.

[0126] At this time, the output voltage Vout is greater than the lower limit voltage value VREF_CMP0 and less than the upper limit voltage value VREF_CMP1, which is within the reference voltage range. The linear regulator circuit 200 continues to work stably and continues to monitor whether the output voltage Vout deviates from the reference voltage range.

[0127] Please refer to Figure 11 , Figure 11 This application provides an embodiment of a flowchart illustrating the adjustment process of a logic subunit, as shown below. Figure 11 As shown, after the third adjustment, the linear regulator circuit 200 works normally and stably. The adjustment value CODE1=CODE0+3, and the output voltage Vout is the expected voltage value, that is, the output voltage Vout is within the preset voltage range. Specifically, the output voltage Vout is greater than the lower limit voltage value VREF_CMP0 and less than the upper limit voltage value VREF_CMP1. The first comparison value CMP_OUT0=1 and the second comparison value CMP_OUT1=0.

[0128] Because the load current, input voltage, or temperature at the location of the linear regulator circuit 200 changes (i.e., characteristic changes), the output voltage Vout rises, meaning the output voltage Vout is greater than the upper limit voltage value VREF_CMP1.

[0129] At this time, the second comparison value CMP_OUT1=1, and the logic sub-unit FSM makes the fourth adjustment (i.e., adjustment 4), that is, the adjustment value CODE1 of the current detection cycle = the adjustment value CODE1 of the previous detection cycle (i.e. CODE0+3)-1, so the second reference voltage Vref2 decreases and the output voltage Vout decreases.

[0130] At this time, the output voltage Vout is still greater than the upper limit voltage value VREF_CMP1, the second comparison value CMP_OUT1=1, the logic sub-unit FSM makes the fifth adjustment (i.e. adjustment 5), that is, the adjustment value CODE1 of the current detection cycle = the adjustment value CODE1 of the previous detection cycle (i.e. CODE0+2)-1, so the second reference voltage Vref2 decreases, and the output voltage Vout decreases.

[0131] At this time, the output voltage Vout is greater than the lower limit voltage value VREF_CMP0 and less than the upper limit voltage value VREF_CMP1, which is within the reference voltage range. The linear regulator circuit 200 continues to work stably and continues to monitor whether the output voltage Vout deviates from the reference voltage range.

[0132] In some implementations, the logic subunit (FSM) may be a finite state machine, a controller, a multi-bit adder / subtractor, etc., and this application does not impose any restrictions on it.

[0133] The first input terminal v1 of the second digital-to-analog converter DAC1 is used to receive the first reference voltage Vref1, and the second input terminal data1 of the second digital-to-analog converter DAC1 is used to receive the updated adjustment value DAC1. The second digital-to-analog converter DAC1 is used to determine the second reference voltage Vref2 based on the first reference voltage Vref1 and the updated adjustment value CODE1, and the output terminal of the second digital-to-analog converter DAC1 is used to output the second reference voltage Vref2.

[0134] In the embodiments of this application, the second digital-to-analog converter DAC1 can be an R-2R DAC, a resistor string DAC, a current-driven DAC, etc., and there are no restrictions.

[0135] Please see Figure 12 , Figure 12 A schematic diagram of another voltage adjustment module provided in an embodiment of this application is shown, as follows: Figure 12 As shown, the voltage adjustment module 210 includes: a second range determination unit 214, a second error detection unit 215, and a second voltage adjustment unit 216.

[0136] The input terminal of the second range determination unit 214 is used to receive the first reference voltage Vref1, and the second range determination unit 214 is used to determine the reference voltage range based on the first reference voltage Vref1.

[0137] The second error detection unit 215 is used to acquire the reference voltage range and the output voltage Vout, and to determine the detection value based on the output voltage Vout and the reference voltage range.

[0138] The second voltage adjustment unit 216 is used to update the adjustment value according to the detected value, and to determine the second reference voltage Vref2 according to the first reference voltage Vref1 and the adjustment value.

[0139] Unlike the above embodiments, in the embodiments of this application, the second range determination unit 214 does not need to input a reference value, and can use the value of the first reference voltage Vref1 as the initial value of the second reference voltage Vref2.

[0140] Alternatively, the reference value can be a preset value, that is, the second range determination unit 214 stores a preset reference value, which does not need to be input and can be obtained by calling the internal storage.

[0141] In some embodiments, the error amplification module 220 may include an error amplifier, the first input terminal of the error amplification module 220 is the negative input terminal of the error amplifier, the second input terminal of the error amplification module 220 is the positive input terminal of the error amplifier, and the output terminal of the error amplification module 220 is the output terminal of the error amplifier.

[0142] It is understood that in other embodiments, the error amplification module 220 may also employ other electronic devices, such as OTA amplifiers, folded cascode amplifiers, Cascade amplifiers, etc., without limitation.

[0143] Please see Figure 13 , Figure 13 This paper illustrates a structural schematic diagram of a voltage generation module provided in an embodiment of this application, as shown below. Figure 13 As shown, the voltage generation module 230 includes a switching unit 231 and a load unit 232.

[0144] The control terminal of the switching unit 231 is used to receive the control voltage, the first terminal of the switching unit 231 is used to receive the input voltage Vin, and the second terminal of the switching unit 231 is connected to the connection terminal of the load unit 232; the connection terminal of the load unit 232 is used to connect to the voltage adjustment module 210.

[0145] The switching unit 231 may include a power transistor, which may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), JFET (Junction Field-Effect Transistor), BJT (Bipolar Junction Transistor), PMOS (Positive channel Metal Oxide Semiconductor), or other similar devices.

[0146] The load unit 232 may include resistors, capacitors and other devices to perform voltage division and signal filtering, thereby generating a low-noise output voltage Vout, thus providing a stable power supply for the load module.

[0147] Please see Figure 14 , Figure 14 This paper illustrates a schematic diagram of another voltage generation module provided in an embodiment of this application, as shown below. Figure 14 As shown, the switching unit 231 of the voltage generation module 230 includes a PMOS transistor PG. The gate of the PMOS transistor PG is used to receive the control voltage VPG, and the source of the PMOS transistor PG is used to receive the input voltage Vin.

[0148] Load unit 232 includes resistor R load resistance R load One end generates the output voltage Vout, and the resistor R load One end of the resistor is connected to the drain of the PMOS transistor PG and to the voltage adjustment module 210, feeding back the output voltage Vout to the voltage adjustment module 210; resistor R load One end is also used to connect to load module I load This is used to provide a stable output voltage Vout to the load module. Resistor R load The other end is used for grounding.

[0149] Please see Figure 15 , Figure 15 A schematic flowchart of a voltage regulation control method provided in an embodiment of this application is shown. Figure 15 As shown, the voltage regulation control method provided in this application embodiment can be applied to the above-mentioned linear voltage regulation control circuit 200. Specifically, the voltage regulation control method includes steps S310 to S350.

[0150] Step S310: Determine the reference voltage range based on the received first reference voltage.

[0151] In some implementations, the value of the first reference voltage is used as the initial value of the second reference voltage.

[0152] In other implementations, a reference value can be set for ease of calculation, and the initial value of the second reference voltage can be determined by the first reference voltage and the reference value.

[0153] Optionally, the reference value can be a preset value, in which case the magnitude of the input first reference voltage can be selected based on the preset reference value and the magnitude of the initial value of the required second reference voltage. Optionally, the reference value can be set by the user according to the needs of the application scenario, that is, the user needs to input the corresponding reference value.

[0154] After determining the initial value of the second reference voltage, the reference voltage range is then determined based on the initial value of the second reference voltage.

[0155] The reference voltage range includes the initial value of the second reference voltage; for example, the initial value of the second reference voltage can be used as the intermediate value of the reference voltage range. The size of the reference voltage range can be set according to the control precision required by the application scenario. It is understood that the smaller the reference voltage range, the higher the control precision.

[0156] Step S320: Determine the detection value based on the output voltage and the reference voltage range.

[0157] Step S330: Determine the second reference voltage based on the detected value and the first reference voltage.

[0158] In some implementations, an adjustment value is introduced for ease of calculation, and step S340 determines the second reference voltage based on the detected value and the first reference voltage; including the following steps.

[0159] (1) Update the adjustment value based on the detected value.

[0160] Specifically, the steps involve updating and adjusting values ​​based on the detected values, including: a. If the output voltage is determined to be greater than the maximum value of the reference voltage range based on the detected value, the adjustment value will be reduced by a preset unit to form an updated adjustment value.

[0161] b. If the output voltage is determined to be less than the minimum value of the reference voltage range based on the detected value, the adjustment value will be increased by a preset unit to form an updated adjustment value.

[0162] (2) Determine the second reference voltage based on the first reference voltage and the adjustment value.

[0163] Step S340: Generate a control voltage based on the second reference voltage and the output voltage.

[0164] Step S350: Generate the output voltage based on the control voltage.

[0165] In the embodiments of this application, the detected value is used to reflect the relationship between the output voltage and the reference voltage range. There are three possible relationships between the output voltage and the reference voltage range: the first is that the output voltage is within the reference voltage range; the second is that the output voltage is greater than the maximum value of the reference voltage range; and the third is that the output voltage is less than the minimum value of the reference voltage range.

[0166] If the output voltage is determined to be within the reference voltage range by the detected value, the second reference voltage is not adjusted, that is, the value of the second reference voltage remains unchanged; if the output voltage is determined to be greater than the maximum value of the reference voltage range by the detected value, the value of the second reference voltage is reduced, and then the value of the generated control voltage is adjusted to reduce the magnitude of the output voltage; if the output voltage is determined to be less than the minimum value of the reference voltage range by the detected value, the value of the second reference voltage is increased, and then the value of the generated control voltage is adjusted to increase the magnitude of the output voltage.

[0167] In the embodiments of this application, the control voltage is affected by two factors: a second reference voltage and the output voltage. On the one hand, the generation of the control voltage is directly adjusted by the output voltage; on the other hand, the magnitude of the second reference voltage is adjusted according to the change in the output voltage, thereby adjusting the control voltage. Thus, through a dual feedback path, a rapid response can be made when the output voltage changes.

[0168] In summary, the embodiments of this application provide a linear voltage regulator circuit and a voltage regulation control method. The linear voltage regulator circuit includes a voltage adjustment module, an error amplification module, and a voltage generation module. The voltage adjustment module determines a second reference voltage based on a detected value and a first reference voltage. The first input terminal of the error amplification module receives the second reference voltage, and the output terminal of the error amplification module outputs a control voltage. The voltage generation module generates an output voltage based on the control voltage. The second input terminal of the error amplification module receives the output voltage. The error amplification module generates the control voltage based on the second reference voltage and the output voltage. The voltage adjustment module also determines a reference voltage range based on the first reference voltage and determines a detected value based on the output voltage and the reference voltage range. On one hand, changes in the output voltage are directly fed back to the second input terminal of the error amplification module. On the other hand, changes in the output voltage are also fed back to the first input terminal of the error amplification module through adjustment of the second reference voltage. By employing a dual feedback path, changes in the output voltage can be responded to quickly, thereby significantly optimizing the performance of the linear voltage regulator circuit.

[0169] In this embodiment, the modules / units included in the various devices and products described in the above embodiments can be software modules / units, hardware modules / units, or a combination of both.

[0170] For example, for various devices or products applied to or integrated into a controller, each module / unit can be implemented using hardware methods such as circuits, or at least some modules / units can be implemented using software programs that run on a processor integrated within the controller, while the remaining (if any) modules / units can be implemented using hardware methods such as circuits; for various devices or products applied to or integrated into a controller module, each module / unit can be implemented using hardware methods such as circuits, and different modules / units can be located in the same component (e.g., controller, circuit module, etc.) or different components of the controller module, or at least some modules / units can be implemented using hardware methods such as circuits. The unit can be implemented using software programs that run on the processor integrated within the controller module. The remaining (if any) modules / units can be implemented using hardware methods such as circuits. For various devices and products applied to or integrated into the terminal, all of their modules / units can be implemented using hardware methods such as circuits. Different modules / units can be located in the same component (e.g., controller, circuit module, etc.) or different components within the terminal. Alternatively, at least some modules / units can be implemented using software programs that run on the processor integrated within the terminal, while the remaining (if any) modules / units can be implemented using hardware methods such as circuits.

[0171] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described device and module can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0172] In the several embodiments provided in this application, the coupling between modules can be electrical, mechanical, or other forms of coupling.

[0173] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0174] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A linear voltage regulator circuit, characterized in that, The circuit includes: a voltage adjustment module, an error amplification module, and a voltage generation module; The voltage adjustment module is used to determine the second reference voltage based on the detected value and the received first reference voltage; The first input terminal of the error amplification module is used to receive the second reference voltage; the output terminal of the error amplification module is used to output the control voltage. The voltage generation module is used to generate the output voltage according to the control voltage; The second input terminal of the error amplification module is used to receive the output voltage; the error amplification module is also used to generate the control voltage based on the second reference voltage and the output voltage. The voltage adjustment module is further configured to determine a reference voltage range based on the first reference voltage; and to determine the detection value based on the output voltage and the reference voltage range.

2. The linear voltage regulator circuit according to claim 1, characterized in that, The voltage adjustment module includes: A first range determination unit, wherein a first terminal of the first range determination unit is used to receive the first reference voltage, a second terminal of the first range determination unit is used to receive a reference value, and the first range determination unit is used to determine the reference voltage range based on the first reference voltage and the reference value; A first error detection unit is configured to determine a detection value based on the output voltage and the reference voltage range. A first voltage adjustment unit is configured to update an adjustment value based on the detected value, and to determine a second reference voltage based on the first reference voltage and the adjustment value.

3. The linear voltage regulator circuit according to claim 2, characterized in that, The minimum value of the reference voltage range is the lower limit voltage value, and the maximum value of the reference voltage range is the upper limit voltage value; The first range determination unit includes a first digital-to-analog converter (DAC), a first input terminal of the first DAC is used to receive the first reference voltage, a second input terminal of the first DAC is used to receive the reference value, and the first DAC is used to determine the upper limit voltage value and the lower limit voltage value based on the first reference voltage and the reference value. The first output terminal of the first digital-to-analog converter is used to output the upper limit voltage value, and the second output terminal of the first digital-to-analog converter is used to output the lower limit voltage value.

4. The linear voltage regulator circuit according to claim 3, characterized in that, The detected value includes a first comparison value and a second comparison value; The error detection unit includes a first comparator and a second comparator; The first input terminal of the first comparator is used to receive the output voltage; the second input terminal of the first comparator is used to receive the upper limit voltage value. The first comparator is used to determine a first comparison value based on the output voltage and the upper limit voltage value, and output the first comparison value through the output terminal of the first comparator; The first input terminal of the second comparator is used to receive the output voltage; the second input terminal of the second comparator is used to receive the lower limit voltage value. The second comparator is used to determine a second comparison value based on the output voltage and the lower limit voltage value, and outputs the second comparison value through the output terminal of the second comparator.

5. The linear voltage regulator circuit according to claim 2, characterized in that, The voltage adjustment unit includes a logic subunit and a second digital-to-analog converter; The logic subunit is used to update the adjustment value based on the first comparison value and the second comparison value; The first input terminal of the second digital-to-analog converter is used to receive the first reference voltage, and the second input terminal of the second digital-to-analog converter is used to receive the updated adjustment value; The second digital-to-analog converter is used to determine the second reference voltage based on the first reference voltage and the updated adjustment value, and the output terminal of the second digital-to-analog converter is used to output the second reference voltage.

6. The linear voltage regulator circuit according to claim 1, characterized in that, The voltage adjustment module includes: The second range determination unit has an input terminal for receiving the first reference voltage and is used to determine the reference voltage range based on the first reference voltage. A second error detection unit is used to determine a detection value based on the output voltage and the reference voltage range; The second voltage adjustment unit is used to update the adjustment value according to the detected value, and to determine the second reference voltage according to the first reference voltage and the adjustment value.

7. The linear voltage regulator circuit according to any one of claims 1 to 6, characterized in that, The voltage generation module includes: a switching unit and a load unit; The control terminal of the switching unit is used to receive the control voltage, the first terminal of the switching unit is used to receive the input voltage, and the second terminal of the switching unit is connected to the connection terminal of the load unit; the connection terminal of the load unit is used to connect to the voltage adjustment module.

8. A voltage regulation control method, characterized in that, The method, applied to the linear voltage regulator circuit of claim 1, comprises: The reference voltage range is determined based on the received first reference voltage; The detection value is determined based on the output voltage and the reference voltage range; The second reference voltage is determined based on the detected value and the first reference voltage; A control voltage is generated based on the second reference voltage and the output voltage; The output voltage is generated based on the control voltage.

9. The voltage stabilization control method according to claim 8, characterized in that, Determining the second reference voltage based on the detected value and the first reference voltage includes: Update the adjustment value based on the detected value; The second reference voltage is determined based on the first reference voltage and the adjustment value.

10. The voltage regulation control method according to claim 9, characterized in that, The step of updating the adjustment value based on the detected value includes: If the output voltage is determined to be greater than the maximum value of the reference voltage range based on the detected value, the adjustment value is reduced by a preset unit to form an updated adjustment value; If the output voltage is determined to be less than the minimum value of the reference voltage range based on the detected value, the adjustment value is increased by the preset unit to form an updated adjustment value.

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