Voltage stabilizing circuit, power supply structure and electronic equipment

Abstract

The invention relates to a voltage stabilizing circuit, a power supply structure and electronic equipment. The voltage stabilizing circuit comprises an input end, an output end, a voltage regulating circuit, a first voltage feedback circuit, a second voltage feedback circuit and a driving circuit, wherein the input end of the driving circuit is electrically connected with the output end of the first voltage feedback circuit and the output end of the second voltage feedback circuit, and the output end of the driving circuit is electrically connected with the input end of the voltage regulation circuit. The voltage regulating circuit is electrically connected with the input end and the output end of the voltage stabilizing circuit. The voltage stabilizing precision of the voltage stabilizing circuit is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electronic equipment, and in particular to a voltage stabilizing circuit, a power supply structure and electronic equipment. Background Art

[0002] At present, with the rapid development of electronic technology, the types of electronic devices in electronic devices are becoming more and more abundant, and the performance is getting better and better. For example, the clarity of mobile phone cameras is higher, the resolution of tablet computer displays is higher, and the sound quality of smart speakers is better. Usually, electronic devices use the voltage stabilizing circuit of the power supply structure to power each electronic device, so that each electronic device in the electronic device can work normally.

[0003] With the increase in the types of electronic devices in electronic equipment and the improvement of the performance of each electronic device, factors such as the internal resistance and path impedance of each electronic device are likely to interfere with the power supply structure, causing the output voltage of the power supply structure to fluctuate. Therefore, how to improve the performance of the voltage stabilization circuit in electronic equipment has attracted much attention. Summary of the invention

[0004] The present invention provides a voltage stabilizing circuit, a power supply structure and an electronic device.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a voltage stabilization circuit, including an input terminal and an output terminal, a voltage regulation circuit, a first voltage feedback circuit, a second voltage feedback circuit, and a driving circuit;

[0006] Among them, the input end of the driving circuit is electrically connected to the output end of the first voltage feedback circuit and the output end of the second voltage feedback circuit respectively, the output end of the driving circuit is electrically connected to the input end of the voltage regulating circuit, and the voltage regulating circuit is electrically connected to the input end and output end of the voltage stabilizing circuit respectively.

[0007] In some embodiments, the input terminal of the first voltage feedback circuit is connected to the input terminal of the voltage stabilization circuit;

[0008] An input end of the second voltage feedback circuit is connected to an output end of the voltage stabilizing circuit.

[0009] In some embodiments, the first voltage feedback circuit is used to collect the input voltage signal of the voltage stabilization circuit, obtain a first feedback voltage signal based on the voltage division of the input voltage signal, and output the first feedback voltage signal to the driving circuit;

[0010] The second voltage feedback circuit is used to collect the output voltage signal of the voltage stabilizing circuit, obtain a second feedback voltage signal based on the output voltage signal after voltage division, and output the second feedback voltage signal to the driving circuit;

[0011] The driving circuit is used for driving the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal and the second feedback voltage signal.

[0012] In some embodiments, the first voltage feedback circuit includes a first DC voltage dividing module and a first voltage feedback amplifying module;

[0013] The first DC voltage dividing module is connected to the input end of the voltage stabilizing circuit and the input end of the first voltage feedback amplifying module, and the first DC voltage dividing module is used to collect the DC component in the input voltage signal of the voltage stabilizing circuit, and divide the DC component to obtain a first divided voltage signal;

[0014] The output end of the first voltage feedback amplification module is connected to the driving circuit. The first voltage feedback amplification module is used to differentially amplify the first divided voltage signal and a preset first reference voltage to obtain the first feedback voltage signal, and output the first feedback voltage signal to the driving circuit.

[0015] In some embodiments, the voltage stabilization circuit further includes a first filtering module;

[0016] The first filtering module is connected to the input end of the voltage stabilizing circuit and the input end of the first voltage feedback amplifying module, and is used for filtering to obtain an AC component of a first predetermined frequency in the input voltage signal of the voltage stabilizing circuit, and outputting the AC component of the first predetermined frequency to the first voltage feedback amplifying module;

[0017] The first voltage feedback amplification module is further used to differentially amplify the AC component of the first predetermined frequency and the preset first reference voltage to obtain a third feedback voltage signal, and output the third feedback voltage signal to the driving circuit;

[0018] The driving circuit is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the third feedback voltage signal.

[0019] In some embodiments, the first DC voltage dividing module includes a first resistor and a second resistor, and the first voltage feedback amplifying module includes a first amplifier;

[0020] The first resistor and the second resistor are connected in series to an input end of the voltage stabilizing circuit, the input end of the first amplifier is connected between the first resistor and the second resistor, and the output end of the first amplifier is connected to the driving circuit;

[0021] The first resistor and the second resistor are used to collect a DC component in an input voltage signal of the voltage stabilizing circuit, and divide the DC component to obtain a first divided voltage signal;

[0022] The first amplifier is used for differentially amplifying the first divided voltage signal and a preset first reference voltage to obtain the first feedback voltage signal, and outputting the first feedback voltage signal to the driving circuit.

[0023] In some embodiments, the first filtering module includes a first capacitor;

[0024] The first capacitor is connected to the input end of the voltage stabilizing circuit and the input end of the first amplifier, and the first capacitor is used to filter and obtain an AC component of a first predetermined frequency in the input voltage signal of the voltage stabilizing circuit, and output the AC component of the first predetermined frequency to the first amplifier;

[0025] The first amplifier is further used to differentially amplify the AC component of the first predetermined frequency and the preset first reference voltage to obtain a third feedback voltage signal, and output the third feedback voltage signal to the driving circuit;

[0026] The driving circuit is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the third feedback voltage signal.

[0027] In some embodiments, the voltage stabilization circuit further includes a third voltage feedback circuit;

[0028] The third voltage feedback circuit is connected to the input end of the voltage stabilizing circuit and the input end of the driving circuit, and is used to collect the input voltage signal of the voltage stabilizing circuit, obtain a fourth feedback voltage signal after filtering the input voltage signal, and output the fourth feedback voltage signal to the driving circuit;

[0029] The driving circuit is further used to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal and the fourth feedback voltage signal.

[0030] In some embodiments, the third voltage feedback circuit includes a second filtering module and a differential amplification module;

[0031] The second filtering module is connected to the input end of the voltage stabilizing circuit and the input end of the differential amplifying module, and is used for filtering to obtain a step component in the input voltage signal of the voltage stabilizing circuit, and outputting the step component to the differential amplifying module;

[0032] The output end of the differential amplifier module is connected to the driving circuit. The differential amplifier module is used to differentially amplify the step component and a preset second reference voltage to obtain the fourth feedback voltage signal, and output the fourth feedback voltage signal to the driving circuit.

[0033] In some embodiments, the second filtering module includes a second capacitor, and the differential amplification module includes a second amplifier;

[0034] The second capacitor is connected to the input end of the voltage stabilizing circuit and the input end of the second amplifier, and the second capacitor is used for filtering to obtain a step component in the input voltage signal of the voltage stabilizing circuit, and outputting the step component to the second amplifier;

[0035] The output end of the second amplifier is connected to the driving circuit. The second amplifier is used for differentially amplifying the step component and a preset second reference voltage to obtain the fourth feedback voltage signal, and outputting the fourth feedback voltage signal to the driving circuit.

[0036] In some embodiments, the second voltage feedback circuit includes a second DC voltage dividing module and a second voltage feedback amplifying module;

[0037] The second DC voltage dividing module is connected to the output end of the voltage stabilizing circuit and the input end of the second voltage feedback amplifying module, and the second DC voltage dividing module is used to collect the DC component in the output voltage signal of the voltage stabilizing circuit, and divide the DC component to obtain a second divided voltage signal;

[0038] The output end of the second voltage feedback amplification module is connected to the driving circuit, and the second voltage feedback amplification module is used to differentially amplify the second divided voltage signal and a preset third reference voltage to obtain the second feedback voltage signal, and output the second feedback voltage signal to the driving circuit.

[0039] In some embodiments, the voltage stabilization circuit further includes a third filtering module;

[0040] The third filtering module is connected to the output end of the voltage stabilizing circuit and the input end of the second voltage feedback amplifying module, and is used for filtering to obtain an AC component of a second predetermined frequency in the output voltage signal of the voltage stabilizing circuit, and outputting the AC component of the second predetermined frequency to the second voltage feedback amplifying module;

[0041] The second voltage feedback amplification module is further used to differentially amplify the AC component of the second predetermined frequency and the preset third reference voltage to obtain a fifth feedback voltage signal, and output the fifth feedback voltage signal to the drive circuit;

[0042] The driving circuit is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the fifth feedback voltage signal.

[0043] In some embodiments, the second DC voltage dividing module includes a third resistor and a fourth resistor, and the second voltage feedback amplifying module includes a third amplifier;

[0044] The third resistor and the fourth resistor are connected in series to the output end of the voltage stabilizing circuit, the input end of the third amplifier is connected between the third resistor and the fourth resistor, and the output end of the third amplifier is connected to the driving circuit;

[0045] The third resistor and the fourth resistor are used to collect the DC component in the output voltage signal of the voltage stabilization circuit, and divide the DC component to obtain a second divided voltage signal;

[0046] The third amplifier is used for differentially amplifying the second divided voltage signal and a preset third reference voltage to obtain the second feedback voltage signal, and outputting the second feedback voltage signal to the driving circuit.

[0047] In some embodiments, the third filtering module includes a third capacitor;

[0048] The third capacitor is connected to the output end of the voltage stabilizing circuit and the input end of the third amplifier, and the third capacitor is used for filtering to obtain an AC component of a second predetermined frequency in the output voltage signal of the voltage stabilizing circuit, and outputting the AC component of the second predetermined frequency to the third amplifier;

[0049] The third amplifier is further used to differentially amplify the AC component of the second predetermined frequency and the preset third reference voltage to obtain a fifth feedback voltage signal, and output the fifth feedback voltage signal to the driving circuit;

[0050] The driving circuit is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the fifth feedback voltage signal.

[0051] In some embodiments, the voltage regulating circuit includes a field effect transistor;

[0052] The drain of the field effect tube is connected to the input end of the voltage stabilizing circuit, the source of the field effect tube is connected to the output end of the voltage stabilizing circuit, and the gate of the field effect tube is connected to the output end of the driving circuit;

[0053] The field effect transistor is used to adjust the output voltage of the voltage stabilizing circuit according to the driving signal output by the driving circuit.

[0054] In some embodiments, it is characterized in that the driving circuit includes a fourth amplifier;

[0055] The non-inverting input terminal of the fourth amplifier is connected to the output terminal of the first voltage feedback circuit and the output terminal of the second voltage feedback circuit;

[0056] The output end of the fourth amplifier is connected to the voltage regulating circuit;

[0057] The fourth amplifier is at least used to superimpose the first feedback voltage signal and the second feedback voltage signal, perform differential amplification with a preset fourth reference voltage, and output the differentially amplified signal to the voltage regulation circuit.

[0058] According to a second aspect of an embodiment of the present disclosure, there is provided a power supply structure, comprising a power supply circuit and the voltage stabilizing circuit described in the first aspect;

[0059] The output end of the power supply circuit is connected to the voltage stabilizing circuit;

[0060] The voltage stabilizing circuit is used to stabilize the output voltage of the power supply circuit to a predetermined voltage.

[0061] According to a third aspect of the embodiments of the present disclosure, there is provided an electronic device, comprising a functional module and the voltage stabilizing circuit described in the first aspect or the power supply structure described in the second aspect;

[0062] The output end of the voltage stabilizing circuit is connected to the functional module;

[0063] The voltage stabilizing circuit is used to output the predetermined voltage to the functional module.

[0064] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0065] In the embodiments of the present disclosure, by setting up two voltage feedback circuits to connect the driving circuit, the voltage regulation circuit can obtain more comprehensive feedback information from the driving circuit, which in turn helps the voltage regulation circuit to regulate the voltage and can effectively improve the voltage regulation accuracy of the voltage stabilization circuit for the output voltage.

[0066] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0068] Figure 1 It is a structural schematic diagram of a voltage stabilizing circuit shown in an embodiment of the present disclosure.

[0069] Figure 2 This is a schematic diagram of the circuit structure of a voltage stabilizing circuit in the related art. Figure 1 .

[0070] Figure 3 The circuit structure of a voltage stabilizing circuit shown in the embodiment of the present disclosure is Figure 2 .

[0071] Figure 4 It is a schematic diagram of a power supply structure shown in an embodiment of the present disclosure.

[0072] Figure 5 It is a schematic diagram of an electronic device shown in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0073] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0074] Figure 1 is a schematic diagram of a voltage stabilizing circuit shown in an embodiment of the present disclosure, such as Figure 1 As shown, the voltage stabilizing circuit 100 includes an input terminal 105 and an output terminal 106, a voltage regulating circuit 101, a first voltage feedback circuit 102, a second voltage feedback circuit 103, and a driving circuit 104;

[0075] Among them, the input end of the driving circuit 104 is electrically connected to the output end of the first voltage feedback circuit 102 and the output end of the second voltage feedback circuit 103 respectively, the output end of the driving circuit 104 is electrically connected to the input end of the voltage regulating circuit 101, and the voltage regulating circuit 101 is electrically connected to the input end 105 and the output end 106 of the voltage stabilizing circuit respectively.

[0076] It should be noted that electronic devices can usually provide power to various electronic devices in the electronic device through the design of the power supply structure. Among them, the voltage stabilizing circuit 100 is an important component of the power supply structure, and is usually used to output a stable predetermined voltage to each electronic device. (For example, a mobile phone can provide a stable 2.8V power supply to the camera through the voltage stabilizing circuit 100).

[0077] In the embodiment of the present disclosure, the voltage stabilizing circuit 100 can be applied to the power supply structure of the electronic device to provide a predetermined voltage to each device of the electronic device. Among them, the voltage stabilizing circuit 100 includes an input terminal 105 and an output terminal 106. There are many ways to design the voltage stabilizing circuit 100 in the power supply structure. The output terminal of the power supply circuit of the power supply structure can be directly connected to the input terminal 105 of the voltage stabilizing circuit 100, and the voltage is reduced and stabilized to a predetermined voltage by the voltage stabilizing circuit 100, and the predetermined voltage is output to each device in the electronic device through the output terminal 106 of the voltage stabilizing circuit 100; or the output terminal of the power supply circuit of the power supply structure is connected to the step-down circuit, and the output terminal of the step-down circuit is connected to the input terminal 105 of the voltage stabilizing circuit 100, and the power output voltage is reduced by the step-down circuit, and then the reduced voltage is stabilized to a predetermined voltage by the voltage stabilizing circuit 100, and the predetermined voltage is output to each device in the electronic device through the output terminal 106 of the voltage stabilizing circuit 100.

[0078] In the embodiment of the present disclosure, the driving circuit 104 can be an amplifier circuit or an anti-backfeed circuit. The input end of the driving circuit 104 is respectively connected to the output end of the first voltage feedback circuit 102 and the output end of the second voltage feedback circuit 103. The output end of the driving circuit 104 is electrically connected to the input end of the voltage regulation circuit 101. The driving circuit 104 can be used to drive the voltage regulation circuit 101 to regulate the output voltage of the voltage stabilization circuit 100.

[0079] It should be noted that when the driving capabilities of the first voltage feedback circuit 102 and the second voltage feedback circuit 103 are small and cannot directly drive the voltage regulation circuit 101 to work normally, the driving circuit 104 can be set as an amplifier circuit; when the driving capabilities of the first voltage feedback circuit 102 and the second voltage feedback circuit 103 are large enough to directly drive the voltage regulation circuit 101 to work normally, the driving circuit 104 can be set as an anti-backfeed circuit.

[0080] In the embodiment of the present disclosure, the voltage regulating circuit 101 may be a transistor, a field effect transistor, etc., and the voltage regulating circuit 101 is respectively connected to the input terminal 105 and the output terminal 106 of the voltage stabilizing circuit 100. For example, the collector of the transistor is connected to the input terminal 105 of the voltage stabilizing circuit 100, and the emitter of the transistor is connected to the output terminal 106 of the voltage stabilizing circuit 100; for another example, the drain of the field effect transistor is connected to the input terminal 105 of the voltage stabilizing circuit 100, and the source of the field effect transistor is connected to the output terminal 106 of the voltage stabilizing circuit 100.

[0081] In the embodiment of the present disclosure, there are various ways to arrange the first voltage feedback circuit 102 and the second voltage feedback circuit 103 in the voltage stabilizing circuit 100. The input end of the first voltage feedback circuit 102 and the input end of the second voltage feedback circuit 103 may be connected to the input end 105 of the voltage stabilizing circuit 100; the input end of the first voltage feedback circuit 102 and the input end of the second voltage feedback circuit 103 may be connected to the output end 106 of the voltage stabilizing circuit 100; or the input end of the first voltage feedback circuit 102 may be connected to the input end 105 of the voltage stabilizing circuit 100, and the input end of the second voltage feedback circuit 103 may be connected to the output end 106 of the voltage stabilizing circuit 100.

[0082] Figure 2 This is a schematic diagram of the circuit structure of a voltage stabilizing circuit in the related art. Figure 1 ,like Figure 2As shown, the voltage stabilizing circuit includes: an output feedback network composed of a voltage dividing sampling unit (resistors R21 and R22), an error amplifying unit (U201), and a transistor adjusting unit (Q201). In the related art, the output voltage V2 of the voltage stabilizing circuit is divided by the voltage dividing sampling unit to obtain an output voltage V22; the error amplifying unit compares the output voltage V22 with the reference voltage V20, amplifies the comparison result to obtain a feedback voltage Vg and outputs it to the transistor adjusting unit; the transistor adjusting unit is turned on by the feedback voltage and adjusts the output voltage V2, so that the output voltage V2 of the voltage stabilizing circuit is stabilized at a predetermined value. For example, when the output voltage V2 of the voltage stabilizing circuit decreases relative to the predetermined voltage, V22 sampled by the voltage-dividing sampling unit will decrease accordingly, and the result of the differential amplification of V20 and V22 by the error amplifying unit U201 will increase, that is, the feedback voltage Vg output by U201 to Q201 will increase accordingly, and the conduction current in Q201 will increase, so the output voltage Vout of the voltage stabilizing circuit will increase, thereby helping the output voltage V2 of the voltage stabilizing circuit to stabilize at a predetermined value. In the related art, the output voltage feedback method is mainly used to optimize the stability performance of the voltage stabilizing circuit. For example, an operational amplifier with a high bandwidth and a high voltage conversion rate can be used as a device of the error amplifying unit to increase the response bandwidth of the output feedback network and achieve a high power supply ripple rejection ratio (PSRR).

[0083] It should be noted that there are many factors that cause the output voltage fluctuation of the voltage stabilizing circuit. For example, the fluctuation of the input voltage signal of the voltage stabilizing circuit will be transmitted to the output end, causing the output voltage fluctuation. For example, changes in the current and resistance at the load end of the voltage stabilizing circuit will also cause the output voltage fluctuation. However, in the related art, the output voltage is monitored by a voltage feedback circuit, focusing on tracking the output voltage fluctuation caused by the load end. Therefore, the method of controlling the output voltage of the voltage stabilizing circuit through the output feedback network can only reduce the voltage fluctuation caused by the load end on the one hand; on the other hand, the feedback effect of a single voltage feedback circuit may not be very accurate, so the effect of improving the power supply performance of the voltage stabilizing circuit is limited.

[0084] In this regard, in the embodiments of the present disclosure, on the one hand, when the two feedback circuits are respectively arranged at the input end 105 and the output end 106 of the voltage stabilizing circuit 100, the voltage regulating circuit 101 can respectively obtain the input voltage fluctuation and the output voltage fluctuation of the voltage stabilizing circuit 100, so that the voltage regulating circuit 101 can obtain the feedback signal by integrating the fluctuations of the front and back ends, and is no longer limited to monitoring the voltage fluctuation only from one side, thereby reducing the situation where the voltage regulation is limited; on the other hand, when the two feedback circuits are both arranged at the input end 105 or the output end 106 of the voltage stabilizing circuit 100, the voltage stabilizing circuit 100 can obtain feedback of the two input voltages or the output voltages, so that the driving circuit 104 can output the feedback signal to the voltage regulating circuit 101 after weighted processing based on the two voltage feedbacks, so that the voltage regulating circuit 101 can regulate the output voltage more accurately. It can be understood that the embodiment of the present disclosure, by setting up two voltage feedback circuits connected to the driving circuit 104, can enable the voltage regulation circuit 101 to obtain more comprehensive feedback information from the driving circuit 104, thereby helping the voltage regulation circuit 101 to regulate the voltage, and can effectively improve the voltage regulation accuracy of the voltage stabilization circuit 100 for the output voltage.

[0085] In some embodiments, the input terminal of the first voltage feedback circuit 102 is connected to the input terminal 105 of the voltage stabilization circuit 100;

[0086] An input terminal of the second voltage feedback circuit 103 is connected to an output terminal 106 of the voltage stabilizing circuit 100 .

[0087] In the embodiment of the present disclosure, the input end of the first voltage feedback circuit 102 is connected to the input end 105 of the voltage stabilizing circuit 100, and is used to detect the changes of the input voltage signal of the input end 105 of the voltage stabilizing circuit 100 in real time; the input end of the second voltage feedback circuit 103 is connected to the output end 106 of the voltage stabilizing circuit 100, and is used to detect the changes of the input voltage signal of the input end 105 of the voltage stabilizing circuit 100 in real time.

[0088] In the disclosed embodiment, the first voltage feedback circuit 102 tracks the input voltage fluctuation of the voltage stabilizing circuit 100 and determines the input feedback signal, and the second voltage feedback circuit 103 tracks the output voltage fluctuation of the voltage stabilizing circuit 100 and determines the output feedback signal, so that the driving circuit 104 can drive the voltage regulating circuit 101 to adjust the output voltage of the voltage stabilizing circuit 100 according to the input feedback signal and the output feedback signal of the voltage stabilizing circuit 100. On the one hand, the first voltage feedback circuit 102 monitors the voltage fluctuation at the input terminal 105 of the voltage stabilizing circuit 100, so that the voltage regulating circuit 101 can adjust the output voltage according to the input feedback signal, without having to wait until the voltage fluctuation at the input terminal 105 is transmitted and manifested as the output voltage fluctuation at the output terminal 106 before adjusting the output voltage, thereby improving the voltage stabilizing efficiency of the voltage stabilizing circuit 100; on the other hand, adding the first voltage feedback circuit 102 to adjust the voltage fluctuation at the input terminal 105 reduces the impact of the input voltage fluctuation on the output voltage, which is beneficial for the second voltage feedback circuit 103 to focus on monitoring the output fluctuation caused by the change at the load terminal, thereby improving the voltage stabilizing accuracy of the output voltage of the voltage stabilizing circuit 100.

[0089] In some embodiments, the first voltage feedback circuit 102 is used to collect the input voltage signal of the voltage stabilizing circuit 100, obtain a first feedback voltage signal based on the voltage division of the input voltage signal, and output the first feedback voltage signal to the driving circuit 104;

[0090] The second voltage feedback circuit 103 is used to collect the output voltage signal of the voltage stabilizing circuit 100, obtain a second feedback voltage signal based on the output voltage signal after voltage division, and output the second feedback voltage signal to the driving circuit 104;

[0091] The driving circuit 104 is used to drive the voltage regulating circuit 101 to regulate the output voltage of the voltage stabilizing circuit 100 according to the first feedback voltage signal and the second feedback voltage signal.

[0092] In the embodiment of the present disclosure, the first voltage feedback circuit 102 divides the input voltage signal of the voltage stabilizing circuit 100 to obtain a first feedback voltage signal; the output end of the first voltage feedback circuit 102 is connected to the input end of the driving circuit 104 for outputting the first feedback voltage signal to the driving circuit 104.

[0093] In the disclosed embodiment, the second voltage feedback circuit 103 divides the output voltage signal of the voltage stabilizing circuit 100 to obtain a second feedback voltage signal; the output end of the second voltage feedback circuit 103 is connected to the input end of the driving circuit 104 for outputting the second feedback voltage signal to the driving circuit 104.

[0094] In the embodiment of the present disclosure, the driving circuit 104 drives the voltage regulating circuit 101 to regulate the output voltage of the voltage stabilizing circuit 100 according to the first feedback voltage signal and the second feedback voltage signal. For example, the output end of the amplifier is connected to the gate of the field effect transistor, and after the amplifier superimposes and amplifies the first feedback voltage signal and the second feedback voltage signal, the field effect transistor regulates the output voltage of the voltage stabilizing circuit 100 according to the superimposed feedback voltage signal; for another example, the output end of the anti-backfeed circuit is connected to the base of the transistor, and the transistor regulates the output voltage of the voltage stabilizing circuit 100 according to the first feedback voltage signal and the second feedback voltage signal.

[0095] In the embodiment of the present disclosure, the first voltage feedback circuit 102 tracks the change of the input voltage signal of the voltage stabilizing circuit 100 and determines the first feedback voltage signal, and the second voltage feedback circuit 103 tracks the change of the output voltage signal of the voltage stabilizing circuit 100 and determines the second feedback voltage signal, so that the driving circuit 104 can comprehensively drive the voltage regulating circuit 101 to adjust the output voltage according to the first feedback voltage signal at the input end and the second feedback voltage signal at the output end of the voltage stabilizing circuit 100. On the one hand, the first voltage feedback circuit 102 can monitor the fluctuation of the input voltage of the voltage stabilizing circuit 100, and the voltage regulating circuit 101 can adjust the output voltage according to the first feedback voltage signal, without waiting for the fluctuation of the input voltage signal to be transmitted and expressed as the fluctuation of the output voltage signal, and then adjust the output voltage, thereby improving the voltage stabilization efficiency of the voltage stabilizing circuit 100; on the other hand, the addition of the first voltage feedback circuit 102 to adjust the input voltage fluctuation reduces the influence of the input voltage signal fluctuation on the output voltage, which is conducive to the second voltage feedback circuit 103 focusing on monitoring the output fluctuation caused by the change of the load end, thereby improving the voltage stabilization accuracy of the output voltage of the voltage stabilizing circuit 100.

[0096] In some embodiments, the first voltage feedback circuit 102 includes a first DC voltage dividing module and a first voltage feedback amplifying module;

[0097] The first DC voltage dividing module is connected to the input terminal 105 of the voltage stabilizing circuit 100 and the input terminal of the first voltage feedback amplifying module, and the first DC voltage dividing module is used to collect the DC component in the input voltage signal of the voltage stabilizing circuit 100, and divide the DC component to obtain a first divided voltage signal;

[0098] The output end of the first voltage feedback amplifier module is connected to the driving circuit 104 , and the first voltage feedback amplifier module is used to differentially amplify the first divided voltage signal and a preset first reference voltage to obtain the first feedback voltage signal, and output the first feedback voltage signal to the driving circuit 104 .

[0099] In the embodiment of the present disclosure, the first DC voltage dividing module can be a variable resistor; it can also be a voltage dividing module composed of multiple fixed resistors; it can also be a voltage dividing module composed of fixed resistors and variable resistors. The first DC voltage dividing module can collect the DC component of the input voltage of the voltage stabilizing circuit 100 and perform voltage division processing, and output the obtained first voltage dividing voltage signal to the first voltage feedback amplification module.

[0100] In the embodiment of the present disclosure, the first voltage feedback amplification module may be an amplification module composed of discrete transistors, resistors, etc.; or an integrated amplifier, and the first voltage feedback amplification module may differentially amplify the first divided voltage signal and the preset first reference voltage, and output the differentially amplified first feedback voltage signal to the driving circuit 104. The value of the preset first reference voltage may be determined according to the predetermined input voltage value of the voltage stabilizing circuit 100 and the first DC voltage dividing module.

[0101] In the embodiment of the present disclosure, the DC component (first divided voltage signal) of the input voltage signal of the voltage stabilizing circuit 100 can be detected in real time through the first DC voltage divider module, and the first divided voltage signal and the preset first reference voltage can be differentially amplified through the first voltage feedback amplification module, so that the voltage stabilizing circuit 100 can compensate for the DC part of the input voltage fluctuation, thereby improving the compensation accuracy of the DC component of the output voltage of the voltage stabilizing circuit 100.

[0102] In some embodiments, the voltage stabilization circuit 100 further includes a first filtering module;

[0103] The first filtering module is connected to the input terminal 105 of the voltage stabilizing circuit 100 and the input terminal of the first voltage feedback amplifying module, and the first filtering module is used to filter and obtain an AC component of a first predetermined frequency in the input voltage signal of the voltage stabilizing circuit 100, and output the AC component of the first predetermined frequency to the first voltage feedback amplifying module;

[0104] The first voltage feedback amplification module is further used to differentially amplify the AC component of the first predetermined frequency and the preset first reference voltage to obtain a third feedback voltage signal, and output the third feedback voltage signal to the driving circuit 104;

[0105] The driving circuit 104 is further configured to drive the voltage regulating circuit 101 to regulate the output voltage of the voltage stabilizing circuit 100 according to the first feedback voltage signal, the second feedback voltage signal, and the third feedback voltage signal.

[0106] In the embodiment of the present disclosure, the first filtering module can be a capacitor; it can also be an inductor; it can also be a filtering module composed of capacitors, inductors, resistors and other components. The first filtering module can filter the input voltage signal. By setting the component parameters in the first filtering module, the first filtering module can generate a low-impedance path for the AC component of the first predetermined frequency, so that the AC component of the first predetermined frequency in the input voltage of the voltage stabilizing circuit 100 is output to the first voltage feedback amplification module through the first filtering module.

[0107] In the disclosed embodiment, the first voltage feedback amplification module differentially amplifies the AC component of the first predetermined frequency and the preset first reference voltage to obtain a third feedback voltage signal and outputs it to the drive circuit 104 so that the drive circuit 104 drives the voltage regulation circuit 101 to regulate the output voltage.

[0108] It should be noted that the ripple of the voltage stabilizing circuit 100 was mainly manifested as fluctuations of DC signals and low-frequency AC signals. However, with the rapid development of electronic devices, such as the increasingly high-definition mobile phone cameras, the frequency of ripple noise has increased from low-frequency signals of 0 to 100 KHz to high-frequency signals of about 1 MHz, resulting in electronic devices having increasingly higher performance requirements for power supply structures. In this regard, in the disclosed embodiment, the frequency of the noise to be suppressed can be determined as a first predetermined frequency, and a first filtering module is set between the input end of the voltage stabilizing circuit and the input end of the first voltage feedback amplifier module. The AC signal of the first predetermined frequency in the input voltage signal is filtered out by the first filtering module, and the noise of the first predetermined frequency is suppressed by the first voltage feedback amplifier module.

[0109] In the embodiment of the present disclosure, the first filtering module can be set to track the AC signal of the first predetermined frequency, so that the impedance of the voltage signal of the first predetermined frequency is reduced to increase the feedback gain of the AC signal of the first predetermined frequency, thereby improving the differential amplification effect of the first voltage feedback amplification module, enhancing the filtering effect of the voltage regulation circuit 101 on the AC component of the first predetermined frequency, and improving the compensation accuracy of the AC component of the voltage stabilizing circuit 100.

[0110] In some embodiments, the first DC voltage dividing module includes a first resistor and a second resistor, and the first voltage feedback amplifying module includes a first amplifier;

[0111] The first resistor and the second resistor are connected in series to the input terminal 105 of the voltage stabilizing circuit 100, the input terminal of the first amplifier is connected between the first resistor and the second resistor, and the output terminal of the first amplifier is connected to the driving circuit 104;

[0112] The first resistor and the second resistor are used to collect a DC component in an input voltage signal of the voltage stabilizing circuit 100, and divide the DC component to obtain a first divided voltage signal;

[0113] The first amplifier is used for differentially amplifying the first divided voltage signal and a preset first reference voltage to obtain the first feedback voltage signal, and outputting the first feedback voltage signal to the driving circuit 104 .

[0114] In the embodiment of the present disclosure, the first resistor and the second resistor may form a voltage dividing module for collecting the DC component of the input voltage of the voltage stabilizing circuit 100 and performing voltage division processing to obtain a first voltage divided voltage signal after voltage division. Figure 3 The circuit structure of a voltage stabilizing circuit shown in the embodiment of the present disclosure is Figure 2 ,like Figure 3 As shown, the first DC voltage dividing module is composed of a first resistor (R3) and a second resistor (R4) connected in series, and R3 and R4 divide the DC component of the input voltage to obtain a first divided voltage signal.

[0115] In the embodiment of the present disclosure, the first amplifier can be set as a single negative feedback amplifier; or it can be set as a cascade of multiple negative feedback amplifiers, and the first amplifier is used to differentially amplify the first divided voltage signal and the preset first reference voltage to obtain a first feedback voltage signal, and output the first feedback voltage signal to the driving circuit 104. Figure 3 As shown, the in-phase terminal of the negative feedback amplifier (first amplifier) ​​U102 is set to the preset first reference voltage, and the inverting input terminal of U102 is connected between R3 and R4. U102 performs differential calculation on the first divided voltage signal and the preset first reference voltage, and amplifies the differential calculation result and outputs it to the driving circuit 104, so that the driving circuit 104 drives the voltage regulating circuit 101 to regulate the output voltage. According to the predetermined input voltage value V31, R3, and R4, the value of the preset first reference voltage can be calculated to be

[0116] In the embodiment of the present disclosure, the first DC voltage divider module composed of the first resistor and the second resistor, and the first voltage feedback amplification module composed of the first amplifier make the voltage stabilization circuit 100 simple in design and highly integrated, which is conducive to the miniaturization of the voltage stabilization circuit 100. In some embodiments, the first filtering module includes a first capacitor;

[0117] The first capacitor is connected to the input terminal 105 of the voltage stabilizing circuit 100 and the input terminal of the first amplifier, and the first capacitor is used to filter and obtain an AC component of a first predetermined frequency in the input voltage signal of the voltage stabilizing circuit 100, and output the AC component of the first predetermined frequency to the first amplifier;

[0118] The first amplifier is further used to differentially amplify the AC component of the first predetermined frequency and the preset first reference voltage to obtain a third feedback voltage signal, and output the third feedback voltage signal to the driving circuit 104;

[0119] The driving circuit 104 is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit 100 according to the first feedback voltage signal, the second feedback voltage signal, and the third feedback voltage signal.

[0120] In the embodiment of the present disclosure, the first capacitor may be a high-pass filter capacitor, a band-pass filter capacitor, etc. Figure 3 As shown, one end of the first capacitor (C2) is connected to the input end 105 of the voltage stabilizing circuit 100, and the other end of the first capacitor (C2) is connected to the negative feedback amplifier (U102). C2 is used to filter the input voltage signal of the voltage stabilizing circuit 100 to obtain an AC signal of a first predetermined frequency in the input voltage signal; U102 differentially amplifies the AC signal of the first predetermined frequency and a preset first reference voltage to obtain a third feedback voltage signal, so that the driving circuit 104 drives the voltage regulating circuit 101 according to the first feedback voltage signal, the second feedback voltage signal and the third feedback voltage signal, thereby reducing the voltage fluctuation caused by the AC signal of the preset first predetermined frequency.

[0121] In the embodiment of the present disclosure, a first capacitor is used for filtering to reduce the output voltage loss of the AC signal of the first predetermined frequency, which is beneficial to improving the feedback gain of the first voltage feedback circuit 102 for the AC signal of the first predetermined frequency, and improving the filtering effect of the voltage regulation circuit 101 on the AC component of the first predetermined frequency, thereby facilitating improving the compensation accuracy of the AC component in the input voltage signal of the voltage stabilizing circuit 100.

[0122] In some embodiments, the voltage stabilization circuit 100 further includes a third voltage feedback circuit;

[0123] The third voltage feedback circuit is connected to the input terminal 105 of the voltage stabilizing circuit 100 and the input terminal of the driving circuit 104, and is used to collect the input voltage signal of the voltage stabilizing circuit 100, obtain a fourth feedback voltage signal after filtering based on the input voltage signal, and output the fourth feedback voltage signal to the driving circuit 104;

[0124] The driving circuit 104 is further configured to drive the voltage regulating circuit 101 to regulate the output voltage of the voltage stabilizing circuit 100 according to the first feedback voltage signal, the second feedback voltage signal, and the fourth feedback voltage signal.

[0125] In the embodiment of the present disclosure, the input end of the third voltage feedback circuit is connected to the input end 105 of the voltage stabilizing circuit 100, and the input voltage signal of the voltage stabilizing circuit 100 is filtered to obtain a fourth feedback voltage signal; the output end of the third voltage feedback circuit is connected to the input end of the driving circuit 104, and is used to output the fourth feedback voltage signal to the driving circuit 104.

[0126] It should be noted that the input voltage signal of the voltage stabilizing circuit 100 may generally contain noise signals of multiple frequencies, or may also contain noise such as short pulses and step signals with non-fixed frequencies. These factors will cause the input voltage signal of the voltage stabilizing circuit 100 to fluctuate, thereby causing the output voltage signal to be unstable. In this regard, in the embodiment of the present disclosure, the third voltage feedback circuit can be set as a first filtering module for filtering noise signals of a specific frequency; it can also be set as a module for filtering step noise, for filtering step noise in the input voltage signal of the voltage stabilizing circuit 100.

[0127] In the embodiment of the present disclosure, a third voltage feedback circuit is added, and the driving circuit 104 drives the voltage regulation circuit 101 according to the first feedback voltage signal, the second feedback voltage signal and the fourth feedback voltage signal, so that the voltage regulation circuit can be adjusted according to more and more comprehensive feedback signals, thereby enhancing the adjustment capability of the voltage regulation circuit 101, which is beneficial to improving the output voltage accuracy of the voltage stabilization circuit 100.

[0128] In some embodiments, the third voltage feedback circuit includes a second filtering module and a differential amplification module;

[0129] The second filtering module is connected to the input terminal 105 of the voltage stabilizing circuit 100 and the input terminal of the differential amplifying module, and the second filtering module is used to filter and obtain the step component in the input voltage signal of the voltage stabilizing circuit 100, and output the step component to the differential amplifying module;

[0130] The output end of the differential amplifier module is connected to the driving circuit 104 , and the differential amplifier module is used to differentially amplify the step component and a preset second reference voltage to obtain the fourth feedback voltage signal, and output the fourth feedback voltage signal to the driving circuit 104 .

[0131] In the disclosed embodiment, the second filtering module may be a capacitor; or an inductor; or a filtering module composed of capacitors, inductors, resistors and other components. The second filtering module may filter the input voltage signal. By setting the component parameters in the second filtering module, the second filtering module may generate a low-impedance path for the step signal, so that the step component of the input voltage in the voltage stabilizing circuit 100 is output to the differential amplifier module through the second filtering module.

[0132] In the disclosed embodiment, the differential amplifier module may be a differential amplifier module composed of discrete components such as resistors and capacitors; or an integrated amplifier, and the differential amplifier module differentially amplifies the step component and the preset second reference voltage to obtain a fourth feedback voltage signal and outputs it to the drive circuit 104, so that the drive circuit 104 drives the voltage regulation circuit 101 to regulate the output voltage. The input end of the differential amplifier module may be set to the preset second reference voltage, and the preset second reference voltage may be determined as a predetermined AC signal according to the internal feedback gain of the circuit.

[0133] It should be noted that the step component in the input voltage signal can be a step signal that appears irregularly; it can also be an AC signal with a lower frequency. Within the processing speed allowed by the third voltage feedback circuit, the above step or low-frequency fluctuation can be processed. In addition, when there are short pulses, step signals and other noises in the output voltage signal of the voltage stabilizing circuit 100, a similar feedback circuit can be set at the output end to reduce the influence of such noise on the output voltage signal. The specific implementation method can be set with reference to the third feedback circuit, and the disclosure will not repeat the description.

[0134] In the embodiment of the present disclosure, the step component in the input voltage signal can be tracked by setting the second filtering module, and the step component can be differentially amplified using the differential amplifier module to reduce the proportion of the input voltage fluctuation slope portion, thereby obtaining a more ideal input voltage signal, improving the transient response rate of the output voltage, and improving the regulation efficiency of the voltage regulation circuit 101.

[0135] In some embodiments, the second filtering module includes a second capacitor, and the differential amplification module includes a second amplifier;

[0136] The second capacitor is connected to the input terminal 105 of the voltage stabilizing circuit 100 and the input terminal of the second amplifier, and the second capacitor is used for filtering to obtain a step component in the input voltage signal of the voltage stabilizing circuit 100, and outputting the step component to the second amplifier;

[0137] The output end of the second amplifier is connected to the driving circuit 104 , and the second amplifier is used for differentially amplifying the step component and a preset second reference voltage to obtain the fourth feedback voltage signal, and outputting the fourth feedback voltage signal to the driving circuit 104 .

[0138] In the embodiment of the present disclosure, the second capacitor may be a low-pass filter capacitor, a band-pass filter capacitor, etc. The second capacitor is used to filter the input voltage, obtain the step component in the input voltage signal and output it to the second amplifier. In the embodiment of the present disclosure, the second amplifier may be set as a single differential amplifier; or may be set as a cascade of multiple differential amplifiers. The second amplifier is used to differentially amplify the step component in the input voltage signal and the preset second reference voltage, obtain the fourth feedback voltage signal and output it to the drive circuit 104.

[0139] As mentioned above Figure 3 As shown, the second capacitor (C3) is connected to the input terminal 105 of the voltage stabilizing circuit 100, filtering obtains the step signal in the input voltage signal, and differentially amplifies through the second amplifier (U103) to determine the fourth feedback voltage signal, so that the driving circuit 104 drives the voltage regulating circuit 101 to filter the step component in the input voltage signal.

[0140] In the disclosed embodiment, the second capacitor filters the step signal, and the second amplifier implements a differential amplification function, so that the voltage stabilizing circuit 100 is simple in design and highly integrated, which is conducive to the miniaturization of the voltage stabilizing circuit 100.

[0141] In some embodiments, the second voltage feedback circuit 103 includes a second DC voltage dividing module and a second voltage feedback amplifying module;

[0142] The second DC voltage dividing module is connected to the output terminal 106 of the voltage stabilizing circuit 100 and the input terminal of the second voltage feedback amplifying module, and the second DC voltage dividing module is used to collect the DC component in the output voltage signal of the voltage stabilizing circuit 100, and divide the DC component to obtain a second divided voltage signal;

[0143] The output end of the second voltage feedback amplifier module is connected to the driving circuit 104 , and the second voltage feedback amplifier module is used to differentially amplify the second divided voltage signal and a preset third reference voltage to obtain the second feedback voltage signal, and output the second feedback voltage signal to the driving circuit 104 .

[0144] In the disclosed embodiment, the second DC voltage divider module can be a variable resistor; it can also be a voltage divider module composed of multiple fixed resistors; it can also be a voltage divider module composed of fixed resistors and variable resistors. The second DC voltage divider module can collect the DC component of the output voltage of the voltage stabilizing circuit 100 and perform voltage division processing, and output the obtained second voltage divided voltage signal to the second voltage feedback amplifier module. In the disclosed embodiment, the second voltage feedback amplifier module can be an amplifier module composed of discrete transistors, resistors, etc.; it can also be an integrated amplifier. The second voltage feedback amplifier module can differentially amplify the second voltage divided voltage signal and a preset third reference voltage, and output the differentially amplified second feedback voltage signal to the drive circuit 104. Among them, the value of the preset third reference voltage can be determined according to the predetermined output voltage value of the voltage stabilizing circuit 100 and the second DC voltage divider module.

[0145] In the embodiment of the present disclosure, the DC component (second divided voltage signal) of the output voltage signal of the voltage stabilizing circuit 100 can be detected in real time through the first DC voltage divider module, and the second divided voltage signal and a preset third reference voltage can be differentially amplified through the second voltage feedback amplification module, so that the voltage stabilizing circuit 100 can compensate for the DC part of the output voltage fluctuation, thereby improving the compensation accuracy of the DC component of the output voltage of the voltage stabilizing circuit 100.

[0146] In some embodiments, the voltage stabilization circuit further includes a third filtering module;

[0147] The third filtering module is connected to the output terminal 106 of the voltage stabilizing circuit 100 and the input terminal of the second voltage feedback amplifying module, and the third filtering module is used to filter and obtain the AC component of the second predetermined frequency in the output voltage signal of the voltage stabilizing circuit 100, and output the AC component of the second predetermined frequency to the second voltage feedback amplifying module;

[0148] The second voltage feedback amplification module is further used to differentially amplify the AC component of the second predetermined frequency and the preset third reference voltage to obtain a fifth feedback voltage signal, and output the fifth feedback voltage signal to the driving circuit 104;

[0149] The driving circuit 104 is further configured to drive the voltage regulating circuit 101 to regulate the output voltage of the voltage stabilizing circuit 100 according to the first feedback voltage signal, the second feedback voltage signal, and the fifth feedback voltage signal.

[0150] In the embodiment of the present disclosure, the third filtering module can be a capacitor; it can also be an inductor; it can also be a filtering module composed of capacitors, inductors, resistors and other components. The third filtering module can filter the output voltage signal. By setting the component parameters in the third filtering module, the third filtering module can generate a low-impedance path for the AC component of the second predetermined frequency, so that the AC component of the second predetermined frequency in the output voltage of the voltage stabilizing circuit 100 is output to the second voltage feedback amplification module through the third filtering module.

[0151] In the disclosed embodiment, the second voltage feedback amplifier module differentially amplifies the AC component of the second predetermined frequency and the preset third reference voltage to obtain a fifth feedback voltage signal and outputs it to the drive circuit 104 so that the drive circuit 104 drives the voltage regulation circuit 101 to regulate the output voltage.

[0152] In the embodiment of the present disclosure, the third filtering module can be set to track the AC signal of the second predetermined frequency, so that the impedance of the voltage signal of the second predetermined frequency is reduced to increase the feedback gain of the AC signal of the second predetermined frequency, thereby improving the differential amplification effect of the second voltage feedback amplification module, enhancing the filtering effect of the voltage regulation circuit 101 on the AC component of the second predetermined frequency, and improving the compensation accuracy of the AC component of the voltage stabilizing circuit 100.

[0153] In some embodiments, the second DC voltage dividing module includes a third resistor and a fourth resistor, and the second voltage feedback amplifying module includes a third amplifier;

[0154] The third resistor and the fourth resistor are connected in series to the output terminal 106 of the voltage stabilizing circuit 100, the input terminal of the third amplifier is connected between the third resistor and the fourth resistor, and the output terminal of the third amplifier is connected to the driving circuit 104;

[0155] The third resistor and the fourth resistor are used to collect the DC component in the output voltage signal of the voltage stabilizing circuit 100, and divide the DC component to obtain a second divided voltage signal;

[0156] The third amplifier is used for differentially amplifying the second divided voltage signal and a preset third reference voltage to obtain the second feedback voltage signal, and outputting the second feedback voltage signal to the driving circuit 104 .

[0157] In the embodiment of the present disclosure, the third resistor and the fourth resistor may form a voltage divider module for collecting the DC component of the output voltage of the voltage stabilizing circuit 100 and performing voltage division processing to obtain a second voltage divided voltage signal after voltage division. Figure 3As shown, the second DC voltage dividing module is composed of a third resistor (R1) and a fourth resistor (R2) connected in series, and R1 and R2 divide the DC component of the output voltage to obtain a second divided voltage signal.

[0158] In the embodiment of the present disclosure, the third amplifier can be set as a single negative feedback amplifier; or it can be set as a cascade of multiple negative feedback amplifiers, and the third amplifier is used to differentially amplify the second divided voltage signal and the preset third reference voltage to obtain a second feedback voltage signal, and output the second feedback voltage signal to the driving circuit 104. Figure 3 As shown, the in-phase terminal of the negative feedback amplifier (third amplifier) ​​U101 is set to the preset third reference voltage, and the inverting input terminal of U101 is connected between R1 and R2. U101 performs differential calculation on the second divided voltage signal and the preset third reference voltage, and amplifies the differential calculation result and outputs it to the driving circuit 104, so that the driving circuit 104 drives the voltage regulating circuit 101 to adjust the output voltage. According to the predetermined output voltage value V32, R1, and R2, the value of the preset third reference voltage can be calculated to be

[0159] In the disclosed embodiment, the second DC voltage divider module composed of the third resistor and the fourth resistor and the second voltage feedback amplification module composed of the third amplifier make the voltage stabilizing circuit 100 simple in design and highly integrated, which is conducive to the miniaturization of the voltage stabilizing circuit 100.

[0160] In some embodiments, the third filtering module includes a third capacitor;

[0161] The third capacitor is connected to the output terminal 106 of the voltage stabilizing circuit 100 and the input terminal of the third amplifier. The third capacitor is used to filter and obtain the AC component of the second predetermined frequency in the output voltage signal of the voltage stabilizing circuit 100, and output the AC component of the second predetermined frequency to the third amplifier;

[0162] The third amplifier is further used to differentially amplify the AC component of the second predetermined frequency and the preset third reference voltage to obtain a fifth feedback voltage signal, and output the fifth feedback voltage signal to the driving circuit 104;

[0163] The driving circuit 104 is further configured to drive the voltage regulating circuit 101 to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the fifth feedback voltage signal.

[0164] In the embodiment of the present disclosure, the third capacitor may be a high-pass filter capacitor, a band-pass filter capacitor, etc. Figure 3As shown, the third capacitor (C1) is connected to the output terminal 106 of the voltage stabilizing circuit 100, and the other end of the third capacitor (C1) is connected to the negative feedback amplifier (U101). C1 is used to filter the output voltage signal of the voltage stabilizing circuit 100 to obtain an AC signal of a second predetermined frequency in the output voltage signal. U101 differentially amplifies the AC component of the second predetermined frequency and a preset third reference voltage to determine a fifth feedback voltage signal, so that the driving circuit 104 drives the voltage regulating circuit 101 according to the first feedback voltage signal, the second feedback voltage signal and the fifth feedback voltage signal, thereby reducing the fluctuation caused by the AC signal of the preset second predetermined frequency.

[0165] In the embodiment of the present disclosure, a third capacitor is used for filtering to reduce the output voltage loss of the AC signal of the second predetermined frequency, which is beneficial to improving the feedback gain of the second voltage feedback circuit 103 for the AC signal of the second predetermined frequency, and improving the filtering effect of the voltage regulation circuit 101 on the AC component of the second predetermined frequency, thereby facilitating improving the compensation accuracy of the AC component in the output voltage signal of the voltage stabilizing circuit 100.

[0166] In some embodiments, the voltage regulating circuit includes a field effect transistor;

[0167] The drain of the field effect transistor is connected to the input terminal 105 of the voltage stabilizing circuit 100, the source of the field effect transistor is connected to the output terminal 106 of the voltage stabilizing circuit 100, and the gate of the field effect transistor is connected to the output terminal of the driving circuit 104;

[0168] The field effect transistor is used to adjust the output voltage of the voltage stabilizing circuit 100 according to the driving signal output by the driving circuit 104 .

[0169] In the embodiment of the present disclosure, a field effect transistor is used to adjust the output voltage of the voltage stabilizing circuit 100, which has the advantages of fast response and low power consumption, and is conducive to improving the working efficiency and reliability of the voltage stabilizing circuit 100.

[0170] In some embodiments, the driving circuit 104 includes a fourth amplifier;

[0171] The non-inverting input terminal of the fourth amplifier is connected to the output terminal of the first voltage feedback circuit and the output terminal of the second voltage feedback circuit;

[0172] The output end of the fourth amplifier is connected to the voltage regulating circuit 101;

[0173] The fourth amplifier is at least used for superimposing the first feedback voltage signal and the second feedback voltage signal, performing differential amplification with a preset fourth reference voltage, and outputting the differentially amplified signal to the voltage regulation circuit 101 .

[0174] In the embodiment of the present disclosure, the fourth amplifier may be an adding amplifier, and the fourth amplifier may be connected to the output end of the first voltage feedback circuit 102 and the output end of the second voltage feedback circuit 103 to superimpose the first feedback voltage signal and the second feedback voltage signal; the fourth amplifier may also be connected to the output end of the first voltage feedback circuit 102, the output end of the second voltage feedback circuit 103 and the output end of the third voltage feedback circuit to superimpose the first feedback voltage signal, the second feedback voltage signal and the fourth voltage feedback signal. Figure 3 As shown, the positive input end of the fourth amplifier is connected to negative feedback amplifiers U101, U102 and differential amplifier U103, and the first feedback voltage signal, the second feedback voltage signal, the third feedback voltage signal, the fourth feedback voltage signal and the fifth feedback voltage signal are superimposed.

[0175] In the embodiment of the present disclosure, the fourth amplifier can perform differential amplification on the superimposed signal and the preset fourth reference voltage, and output the differentially amplified signal to the voltage regulating circuit 101, so that the voltage regulating circuit 101 adjusts the output voltage. The input end of the fourth amplifier can be set to a preset fourth reference voltage, and the value of the preset fourth reference voltage can be set based on the output voltage signal and the voltage dividing resistors R1 and R2; or it can be obtained by weighted calculation based on the preset first reference voltage, the preset second reference voltage, and the preset third reference voltage.

[0176] In the disclosed embodiment, the fourth amplifier at least superimposes the feedback signals of the input terminal 105 and the output terminal 106 of the voltage stabilizing circuit 100, so that the voltage regulating module 101 adjusts the output voltage based on the superimposed feedback signals, which is beneficial for the voltage stabilizing circuit 100 to perform comprehensive adjustments for more feedback signals, thereby improving the stability of the output voltage of the voltage stabilizing circuit 100.

[0177] In a second aspect of an embodiment of the present disclosure, a power supply structure 400 is provided. Figure 4 is a schematic diagram of a power supply structure shown in an embodiment of the present disclosure, such as Figure 4 As shown, the power supply structure 400 includes a power supply circuit 401 and a voltage stabilizing circuit 100;

[0178] The output end of the power supply circuit 401 is connected to the voltage stabilizing circuit 100;

[0179] The voltage stabilizing circuit 100 is used to stabilize the output voltage of the power supply circuit 401 to a predetermined voltage.

[0180] In the real-time example of the present disclosure, the power supply structure 400 is generally used in electronic devices to provide a predetermined power supply to each electronic device. The power supply structure 400 may include a power supply circuit 401 and a voltage stabilizing circuit 100, and the voltage stabilizing circuit 100 is used to step down and stabilize the voltage output by the power supply circuit 401 to a predetermined voltage. In addition, the power supply structure 400 may also include a power supply circuit 401, a step-down circuit, and a voltage stabilizing circuit 100, the step-down circuit is connected to the output end of the power supply circuit 401 and the input end 105 of the voltage stabilizing circuit 100, and the step-down circuit is used to step down the voltage output by the power supply circuit 401 and output it to the voltage stabilizing circuit 100, so that the voltage stabilizing circuit 100 stabilizes the stepped-down voltage to a predetermined voltage.

[0181] In the embodiment of the present disclosure, the voltage stabilizing circuit 100 is applied to the power supply structure 400, which is beneficial to improving the stability of the power supply of the power supply structure 400.

[0182] According to a third aspect of the present disclosure, an electronic device 800 is provided. Figure 5 is a schematic diagram of an electronic device shown in an embodiment of the present disclosure, such as Figure 5 As shown, the electronic device 800 includes a functional module 801 and the power supply structure 400 described in the second aspect above;

[0183] The output end of the voltage stabilizing circuit 100 is connected to the functional module 801;

[0184] The voltage stabilizing circuit 100 is used to output the predetermined voltage to the functional module 801 .

[0185] In the disclosed embodiment, the functional module 801 may be various functional devices in the electronic device 800, such as a camera module, a speaker module, a display module, etc. The voltage stabilizing circuit 100 of the power supply structure 400 may provide a stable predetermined voltage to the functional module 801. Since the voltage stabilizing circuit 100 may provide feedback compensation for the fluctuation of the input voltage signal and the fluctuation of the output voltage signal, the power supply structure 400 may provide an efficient and stable predetermined voltage to the functional module 801, so that the function 801 may operate under a stable voltage. For example, the voltage stabilizing circuit 100 may provide a predetermined voltage to the camera module, so as to improve the clarity, resolution and other performance of the camera module.

[0186] In the disclosed embodiment, the electronic device 800 provides a predetermined voltage to the functional module 801 through the voltage stabilizing circuit 100, which is beneficial to improving the performance of the functional module 801 and can improve various performances of the electronic device 800 as a whole.

[0187] The following description will be made by taking the voltage stabilizing circuit 100 for powering the camera in a mobile phone as an example. Figure 3As shown, the voltage stabilizing circuit 100 in the mobile phone includes: an input voltage feedback circuit 301 (composed of R3, R4, C2, U102, C3, U103), an output voltage feedback circuit 302 (composed of R1, R2, C1, U101), an amplifier 303 (U104), and a field effect transistor 304 (Q101). The voltage stabilizing circuit 100 includes but is not limited to the above circuits.

[0188] In the embodiment of the present disclosure, the input voltage signal of the voltage stabilizing circuit 100 is Vin, and the voltage dividing modules R3 and R4 (first DC voltage dividing module) of the input voltage feedback circuit are connected to the input terminal 105 of the voltage stabilizing circuit 100, and are used to collect the DC signal in the input voltage signal Vin in real time and divide the voltage to obtain the DC component of the input voltage signal (first divided voltage signal); the capacitor C2 (first filtering module) of the input voltage feedback is connected to the input terminal 105 of the voltage stabilizing circuit 100, and is used to filter and obtain the AC component with a frequency of 1 MHz in the input voltage signal Vin (first AC component). an AC component of a predetermined frequency); a negative feedback amplifier U102 of an input voltage feedback circuit, wherein the non-inverting input terminal of U102 is set to an input reference voltage (a preset first reference voltage), the inverting input terminal of U102 is connected to voltage divider modules R3, R4 and capacitor C2, and the output terminal of U102 is connected to an amplifier U104, and U102 is used to differentially amplify the DC component and the AC component in the input voltage signal with the input reference voltage to obtain an input voltage DC feedback signal (a first feedback voltage signal) and an input voltage AC feedback signal (a third feedback voltage signal).

[0189] In the disclosed embodiment, the capacitor C3 (second filtering module) of the input voltage feedback circuit is connected to the input terminal 105 of the voltage stabilizing circuit 100, and is used to filter and obtain the step component in the input voltage signal Vin. The differential amplifier U103 of the input voltage feedback circuit has the same phase input terminal set to the input step reference voltage (preset second reference voltage), the inverting input terminal of U103 connected to the capacitor C3, and the output terminal of U103 connected to the amplifier U104. U103 is used to differentially amplify the step component in the input voltage signal and the input step reference voltage to obtain an input voltage step feedback signal (fourth feedback voltage signal).

[0190] In the disclosed embodiment, the output voltage signal of the voltage stabilizing circuit 100 is Vout, and the voltage divider modules R1 and R2 (the second DC voltage divider module) of the output voltage feedback circuit are connected to the output terminal 106 of the voltage stabilizing circuit 100, and are used to collect the DC signal in the output voltage signal Vout in real time and divide the voltage to obtain the DC component of the output voltage signal (the second divided voltage signal); the capacitor C1 (the third filtering module) of the output voltage feedback is connected to the input terminal 105 of the voltage stabilizing circuit 100, and is used to filter and obtain the AC component with a frequency of 1 MHz in the input voltage signal Vout. (AC component of the second predetermined frequency); negative feedback amplifier U101 of the output voltage feedback circuit, the non-inverting input terminal of U101 is set to the output reference voltage (preset third reference voltage), the inverting input terminal of U101 is connected to the voltage divider modules R1, R2 and capacitor C1, and the output terminal of U101 is connected to the amplifier U104, U101 is used to differentially amplify the DC component and AC component in the output voltage signal with the output reference voltage to obtain an output voltage DC feedback signal (second feedback voltage signal) and an output voltage AC feedback signal (fifth feedback voltage signal). In addition, the output terminal 106 of the voltage stabilizing circuit 100 can also be equipped with a step signal monitoring and feedback circuit. The specific method can refer to the setting method of C3 and U103, which will not be repeated here.

[0191] In the disclosed embodiment, the in-phase input terminal of the amplifier U104 is connected to the output terminals of U101, U102, and U103, and the inverting input terminal of U104 is set to a comprehensive reference voltage (preset fourth reference voltage). U104 superimposes the input voltage DC feedback signal, the input voltage AC feedback signal, the input voltage step feedback signal, the output voltage DC feedback signal, and the output voltage AC feedback signal, and differentially amplifies the superimposed comprehensive feedback signal and the comprehensive reference voltage, and outputs the voltage regulation signal after differential amplification to the field effect transistor Q101. Among them, the comprehensive reference voltage can be calculated in proportion according to the preset first reference voltage, the preset second reference voltage, and the preset third reference voltage. In addition, if the driving capability of U101-U103 is sufficient to drive the field effect transistor to work normally and has an anti-backflow function, the setting of U104 can be cancelled to save resources.

[0192] In the disclosed embodiment, the gate of the field effect transistor Q101 is connected to the output terminal of U104, the drain of Q101 is connected to the input terminal 105 of the voltage stabilizing circuit 100, and the source of Q101 is connected to the output terminal 106 of the voltage stabilizing circuit 100. Q101 is used to adjust the output voltage Vout of the voltage stabilizing circuit 100 according to the voltage adjustment signal output by U104, so that the voltage stabilizing circuit 100 can provide a stable predetermined voltage to the camera.

[0193] In the disclosed embodiment, a stable high-voltage bias power supply needs to be provided to U101-U104 so that each amplifier can work normally. If the Vin voltage of the voltage stabilizing circuit 100 is high enough, the chip finger voltage can be provided to each amplifier through Vin; if the Vin voltage of the voltage stabilizing circuit 100 is not enough to drive the amplifier to work, an external power supply Vbias needs to be introduced to provide a high-voltage bias power supply for each amplifier.

[0194] It should be noted that the voltage signal at the input terminal 105 of the voltage stabilizing circuit 100 usually has various noises such as DC voltage drop, periodic switching ripple (AC signal with a specific frequency), transient change (step signal), etc. In this regard, in the embodiment of the present disclosure, the voltage-dividing resistors R3 and R4 of the input voltage feedback circuit provide the DC voltage drop signal in the input voltage signal to U102, and the capacitor C2 provides the AC signal with a specific frequency to U102, so that U102 mainly performs negative feedback on the above low-frequency components; the capacitor C3 of the input voltage feedback circuit provides the step signal to U103, so that U103 can differentially amplify the edges of short pulse signals, step signals, etc., and perform negative feedback on the step components. The input voltage feedback circuit can comprehensively track various noise changes of the input power supply and make corresponding adjustments, which can effectively reduce the impact of the input power supply on the output performance and reduce the control difficulty of U101 in the output voltage feedback circuit, so that U101 can focus on controlling the output voltage fluctuations caused by load changes. The interaction between the input voltage feedback circuit and the output voltage feedback circuit is conducive to improving the overall stability of the input voltage signal.

[0195] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims above.

[0196] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A voltage stabilizing circuit, characterized in that: It includes an input terminal and an output terminal, a voltage regulating circuit, a first voltage feedback circuit, a second voltage feedback circuit, and a driving circuit; Among them, the input end of the driving circuit is electrically connected to the output end of the first voltage feedback circuit and the output end of the second voltage feedback circuit respectively, the output end of the driving circuit is electrically connected to the input end of the voltage regulating circuit, and the voltage regulating circuit is electrically connected to the input end and output end of the voltage stabilizing circuit respectively.

2. The voltage stabilizing circuit according to claim 1, characterized in that: An input end of the first voltage feedback circuit is connected to an input end of the voltage stabilizing circuit; An input end of the second voltage feedback circuit is connected to an output end of the voltage stabilizing circuit.

3. The voltage stabilizing circuit according to claim 2, characterized in that: The first voltage feedback circuit is used to collect the input voltage signal of the voltage stabilizing circuit, obtain a first feedback voltage signal based on the voltage division of the input voltage signal, and output the first feedback voltage signal to the driving circuit; The second voltage feedback circuit is used to collect the output voltage signal of the voltage stabilizing circuit, obtain a second feedback voltage signal based on the output voltage signal after voltage division, and output the second feedback voltage signal to the driving circuit; The driving circuit is used for driving the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal and the second feedback voltage signal.

4. The voltage stabilizing circuit according to claim 3, characterized in that: The first voltage feedback circuit includes a first DC voltage dividing module and a first voltage feedback amplifying module; The first DC voltage dividing module is connected to the input end of the voltage stabilizing circuit and the input end of the first voltage feedback amplifying module, and the first DC voltage dividing module is used to collect the DC component in the input voltage signal of the voltage stabilizing circuit, and divide the DC component to obtain a first divided voltage signal; The output end of the first voltage feedback amplification module is connected to the driving circuit. The first voltage feedback amplification module is used to differentially amplify the first divided voltage signal and a preset first reference voltage to obtain the first feedback voltage signal, and output the first feedback voltage signal to the driving circuit.

5. The voltage stabilizing circuit according to claim 4, characterized in that: The voltage stabilizing circuit further includes a first filtering module; The first filtering module is connected to the input end of the voltage stabilizing circuit and the input end of the first voltage feedback amplifying module, and is used for filtering to obtain an AC component of a first predetermined frequency in the input voltage signal of the voltage stabilizing circuit, and outputting the AC component of the first predetermined frequency to the first voltage feedback amplifying module; The first voltage feedback amplification module is further used to differentially amplify the AC component of the first predetermined frequency and the preset first reference voltage to obtain a third feedback voltage signal, and output the third feedback voltage signal to the driving circuit; The driving circuit is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the third feedback voltage signal.

6. The voltage stabilizing circuit according to claim 5, characterized in that: The first DC voltage dividing module includes a first resistor and a second resistor, and the first voltage feedback amplifying module includes a first amplifier; The first resistor and the second resistor are connected in series to an input end of the voltage stabilizing circuit, the input end of the first amplifier is connected between the first resistor and the second resistor, and the output end of the first amplifier is connected to the driving circuit; The first resistor and the second resistor are used to collect a DC component in an input voltage signal of the voltage stabilizing circuit, and divide the DC component to obtain a first divided voltage signal; The first amplifier is used for differentially amplifying the first divided voltage signal and a preset first reference voltage to obtain the first feedback voltage signal, and outputting the first feedback voltage signal to the driving circuit.

7. The voltage stabilizing circuit according to claim 6, characterized in that: The first filtering module includes a first capacitor; The first capacitor is connected to the input end of the voltage stabilizing circuit and the input end of the first amplifier, and the first capacitor is used to filter and obtain an AC component of a first predetermined frequency in the input voltage signal of the voltage stabilizing circuit, and output the AC component of the first predetermined frequency to the first amplifier; The first amplifier is further used to differentially amplify the AC component of the first predetermined frequency and the preset first reference voltage to obtain a third feedback voltage signal, and output the third feedback voltage signal to the driving circuit; The driving circuit is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the third feedback voltage signal.

8. The voltage stabilizing circuit according to claim 3, characterized in that: The voltage stabilizing circuit further includes a third voltage feedback circuit; The third voltage feedback circuit is connected to the input end of the voltage stabilizing circuit and the input end of the driving circuit, and is used to collect the input voltage signal of the voltage stabilizing circuit, obtain a fourth feedback voltage signal after filtering the input voltage signal, and output the fourth feedback voltage signal to the driving circuit; The driving circuit is further used to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal and the fourth feedback voltage signal.

9. The voltage stabilizing circuit according to claim 8, characterized in that: The third voltage feedback circuit includes a second filtering module and a differential amplification module; The second filtering module is connected to the input end of the voltage stabilizing circuit and the input end of the differential amplifying module, and is used for filtering to obtain a step component in the input voltage signal of the voltage stabilizing circuit, and outputting the step component to the differential amplifying module; The output end of the differential amplifier module is connected to the driving circuit. The differential amplifier module is used to differentially amplify the step component and a preset second reference voltage to obtain the fourth feedback voltage signal, and output the fourth feedback voltage signal to the driving circuit.

10. The voltage stabilizing circuit according to claim 9, characterized in that: The second filtering module includes a second capacitor, and the differential amplification module includes a second amplifier; The second capacitor is connected to the input end of the voltage stabilizing circuit and the input end of the second amplifier, and the second capacitor is used for filtering to obtain a step component in the input voltage signal of the voltage stabilizing circuit, and outputting the step component to the second amplifier; The output end of the second amplifier is connected to the driving circuit. The second amplifier is used for differentially amplifying the step component and a preset second reference voltage to obtain the fourth feedback voltage signal, and outputting the fourth feedback voltage signal to the driving circuit.

11. The voltage stabilizing circuit according to claim 3, characterized in that: The second voltage feedback circuit includes a second DC voltage dividing module and a second voltage feedback amplifying module; The second DC voltage dividing module is connected to the output end of the voltage stabilizing circuit and the input end of the second voltage feedback amplifying module, and the second DC voltage dividing module is used to collect the DC component in the output voltage signal of the voltage stabilizing circuit, and divide the DC component to obtain a second divided voltage signal; The output end of the second voltage feedback amplification module is connected to the driving circuit, and the second voltage feedback amplification module is used to differentially amplify the second divided voltage signal and a preset third reference voltage to obtain the second feedback voltage signal, and output the second feedback voltage signal to the driving circuit.

12. The voltage stabilizing circuit according to claim 11, characterized in that: The voltage stabilizing circuit further includes a third filtering module; The third filtering module is connected to the output end of the voltage stabilizing circuit and the input end of the second voltage feedback amplifying module, and is used for filtering to obtain an AC component of a second predetermined frequency in the output voltage signal of the voltage stabilizing circuit, and outputting the AC component of the second predetermined frequency to the second voltage feedback amplifying module; The second voltage feedback amplification module is further used to differentially amplify the AC component of the second predetermined frequency and the preset third reference voltage to obtain a fifth feedback voltage signal, and output the fifth feedback voltage signal to the drive circuit; The driving circuit is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the fifth feedback voltage signal.

13. The voltage stabilizing circuit according to claim 12, characterized in that: The second DC voltage dividing module includes a third resistor and a fourth resistor, and the second voltage feedback amplifying module includes a third amplifier; The third resistor and the fourth resistor are connected in series to the output end of the voltage stabilizing circuit, the input end of the third amplifier is connected between the third resistor and the fourth resistor, and the output end of the third amplifier is connected to the driving circuit; The third resistor and the fourth resistor are used to collect the DC component in the output voltage signal of the voltage stabilization circuit, and divide the DC component to obtain a second divided voltage signal; The third amplifier is used for differentially amplifying the second divided voltage signal and a preset third reference voltage to obtain the second feedback voltage signal, and outputting the second feedback voltage signal to the driving circuit.

14. The voltage stabilizing circuit according to claim 13, characterized in that: The third filtering module includes a third capacitor; The third capacitor is connected to the output end of the voltage stabilizing circuit and the input end of the third amplifier, and the third capacitor is used for filtering to obtain an AC component of a second predetermined frequency in the output voltage signal of the voltage stabilizing circuit, and outputting the AC component of the second predetermined frequency to the third amplifier; The third amplifier is further used to differentially amplify the AC component of the second predetermined frequency and the preset third reference voltage to obtain a fifth feedback voltage signal, and output the fifth feedback voltage signal to the driving circuit; The driving circuit is further configured to drive the voltage regulating circuit to regulate the output voltage of the voltage stabilizing circuit according to the first feedback voltage signal, the second feedback voltage signal, and the fifth feedback voltage signal.

15. The voltage stabilizing circuit according to claim 3, characterized in that: The voltage regulating circuit includes a field effect transistor; The drain of the field effect tube is connected to the input end of the voltage stabilizing circuit, the source of the field effect tube is connected to the output end of the voltage stabilizing circuit, and the gate of the field effect tube is connected to the output end of the driving circuit; The field effect transistor is used to adjust the output voltage of the voltage stabilizing circuit according to the driving signal output by the driving circuit.

16. The voltage stabilizing circuit according to any one of claims 1 to 15, characterized in that: The driving circuit includes a fourth amplifier; The non-inverting input terminal of the fourth amplifier is connected to the output terminal of the first voltage feedback circuit and the output terminal of the second voltage feedback circuit; The output end of the fourth amplifier is connected to the voltage regulating circuit; The fourth amplifier is at least used to superimpose the first feedback voltage signal and the second feedback voltage signal, perform differential amplification with a preset fourth reference voltage, and output the differentially amplified signal to the voltage regulation circuit.

17. A power supply structure, characterized in that: Comprising a power supply circuit and a voltage stabilizing circuit according to any one of claims 1 to 16; The output end of the power supply circuit is connected to the voltage stabilizing circuit; The voltage stabilizing circuit is used to stabilize the output voltage of the power supply circuit to a predetermined voltage.

18. An electronic device, characterized in that: Comprising a functional module, and the voltage stabilizing circuit according to any one of claims 1 to 16 or the power supply structure according to claim 17; The output end of the voltage stabilizing circuit is connected to the functional module; The voltage stabilizing circuit is used to output the predetermined voltage to the functional module.

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