Linear voltage-stabilized power supply circuit and electronic product

Abstract

The invention provides a linear voltage-stabilized power supply circuit and an electronic product. The linear voltage-stabilizing power supply circuit comprises a low-voltage linear voltage-stabilizing circuit and a voltage-dividing sampling circuit, the voltage-dividing sampling circuit is connected between an input voltage source and the low-voltage linear voltage-stabilizing circuit, the voltage-dividing sampling circuit comprises a first resistor network and a third triode, the first resistor network is used for limiting current flowing into the low-voltage linear voltage-stabilizing circuit, and the third triode is used for limiting current flowing into the low-voltage linear voltage-stabilizing circuit. A quiescent working point of the third triode is provided; and the third triode is used for sharing the voltage drop between the input voltage source and the low-voltage linear voltage stabilizing circuit. The working voltage range of the low-voltage linear voltage stabilizing circuit can be expanded.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a linear voltage-regulated power supply circuit and an electronic product. Background Art

[0002] High-voltage, high-current, linearly adjustable regulated power supplies can be used to drive devices such as piezoelectric ceramics, and are also used in fields that require low-noise, high-voltage, and high-current drive. Piezoelectric ceramics are often used in precision positioning and ultrasonic transmitters, especially in scanning tunneling microscopes (STM), atomic force microscopes (AFM), and ultrasonic processing equipment. Piezoelectric ceramics require a high-voltage and stable driving power supply to ensure linear response and high-precision operation. At the same time, the power supply voltage needs to be adjustable to meet the needs of different applications. In the field of ultrasonic applications, ultrasonic transducers with piezoelectric ceramic elements as core components require high-voltage, low-ripple power supplies to generate stable ultrasonic signals and improve the signal-to-noise ratio of the results. In the field of quantum precision measurement, electro-optic modulators require high voltage electricity to be loaded onto electro-optical crystals to change the refractive index of the crystals, thereby controlling the modulation of the phase, amplitude, intensity, or polarization state of the optical signal. Linearly adjustable stable voltage is conducive to improving the control accuracy of electro-optical crystals.

[0003] In the prior art, high-voltage and high-current power supplies mostly use switching power supplies or simple linear regulators, but switching power supplies are easily affected by electromagnetic interference and have large output ripples; and simple linear regulators are difficult to achieve stable output of high voltage and high current. Summary of the invention

[0004] The purpose of the present application is to provide a linear voltage-regulated power supply circuit and an electronic product, which can at least partially solve the above-mentioned technical problems existing in the prior art.

[0005] One aspect of the present application provides a linear voltage-regulated power supply circuit. The linear voltage-regulated power supply circuit includes a low-voltage linear voltage-regulated circuit and a voltage-dividing sampling circuit, wherein the voltage-dividing sampling circuit is connected between an input voltage source and the low-voltage linear voltage-regulated circuit, and the voltage-dividing sampling circuit includes a first resistor network and a third transistor, wherein the first resistor network is used to limit the current flowing into the low-voltage linear voltage-regulated circuit and provide a static operating point of the third transistor; and the third transistor is used to share the voltage drop between the input voltage source and the low-voltage linear voltage-regulated circuit.

[0006] Furthermore, the low-voltage linear voltage regulator circuit has an input end, an output end and an adjustment end, and the first resistor network includes a fourth resistor, a sixth resistor and a seventh resistor, wherein the fourth resistor is connected between the collector of the third triode and the input voltage source; the sixth resistor is connected between the base of the third triode and the input voltage source, and the seventh resistor is connected between the base of the third triode and the adjustment end of the low-voltage linear voltage regulator circuit; the emitter of the third triode is connected to the input end of the low-voltage linear voltage regulator circuit.

[0007] Further, the low-voltage linear voltage stabilizing circuit includes a first triode, a second triode, a first resistor, a second resistor, a third resistor and a first voltage stabilizing tube, wherein the base of the first triode is connected to the collector of the second triode, the collector of the first triode serves as the input end of the low-voltage linear voltage stabilizing circuit, and the emitter of the first triode serves as the output end of the low-voltage linear voltage stabilizing circuit; the first resistor is connected between the base and the collector of the first triode; the second resistor is connected between the emitter of the first triode and the base of the second triode; the third resistor is connected between the base of the second triode and the regulating end of the low-voltage linear voltage stabilizing circuit; the anode of the first voltage stabilizing tube is connected to the regulating end of the low-voltage linear voltage stabilizing circuit, and the cathode of the first voltage stabilizing tube is connected to the emitter of the second triode.

[0008] Furthermore, the linear voltage-regulated power supply circuit also includes an adjustable control circuit, wherein the adjustable control circuit is connected to the output end of the low-voltage linear voltage-regulated circuit and is used to adjust the output voltage of the low-voltage linear voltage-regulated circuit based on a reference voltage input source.

[0009] Furthermore, the adjustable control circuit includes an error amplifier circuit and a second resistor network, wherein the error amplifier circuit is used to connect to the reference voltage input source to adjust the output voltage of the low-voltage linear voltage regulator circuit; the second resistor network is used to sample the signal size of the output voltage of the low-voltage linear voltage regulator circuit and provide an operating point of the error amplifier circuit.

[0010] Furthermore, the error amplifier circuit includes an operational amplifier, a first power supply, a second power supply, a fourth transistor, an eighth resistor, a ninth resistor and a first capacitor, wherein the non-inverting input terminal of the operational amplifier is connected to the second resistor network, the reverse input terminal of the operational amplifier is connected to the reference voltage input source and is connected to the output terminal of the operational amplifier through the first capacitor; the first power supply and the second power supply are connected to the operational amplifier as positive and negative power supplies, respectively; the base of the fourth transistor is connected to the output terminal of the operational amplifier through the eighth resistor, the collector of the fourth transistor is connected to the output terminal of the low-voltage linear voltage regulator circuit through the ninth resistor, and the emitter of the fourth transistor is grounded.

[0011] Furthermore, the second resistor network includes a tenth resistor and an eleventh resistor connected in series, wherein the tenth resistor and the eleventh resistor are connected in series between the output end of the low-voltage linear voltage regulator circuit and the ground, and the same-direction input end of the operational amplifier is connected between the tenth resistor and the eleventh resistor.

[0012] Furthermore, the first resistor network also includes a fifth resistor connected in series with the fourth resistor, and the fourth resistor and the fifth resistor are used to limit the current flowing into the low-voltage linear voltage regulator circuit. The linear voltage regulated power supply circuit also includes a current expansion circuit, wherein the current expansion circuit is connected between the fourth resistor and the fifth resistor in the voltage divider sampling circuit, and the fourth resistor is used to sample the current flowing into the low-voltage linear voltage regulator circuit to control the operating point of the current expansion circuit; the current expansion circuit is also connected to the output end of the low-voltage linear voltage regulator circuit to increase the output current of the output end of the low-voltage linear voltage regulator circuit.

[0013] Furthermore, the current expansion circuit includes a common collector amplifier circuit, and the common collector amplifier circuit is composed of one or more power devices connected in parallel.

[0014] Further, the current expansion circuit includes a fifth transistor, a sixth transistor, a twelfth resistor and a thirteenth resistor, wherein the base of the fifth transistor is connected to the collector of the sixth transistor and is connected to the regulating end of the low-voltage linear voltage regulator circuit through the twelfth resistor, the collector of the fifth transistor is connected to the emitter of the sixth transistor and is connected to the input voltage source, and the emitter of the fifth transistor is connected to the output end of the low-voltage linear voltage regulator circuit; the base of the sixth transistor is connected between the fourth resistor and the fifth resistor through the thirteenth resistor.

[0015] Furthermore, the fifth transistor includes an NPN Darlington transistor.

[0016] Another aspect of the present application provides an electronic product, wherein the electronic product comprises the linear voltage-regulated power supply circuit as described above.

[0017] The linear voltage regulated power supply circuit and electronic product of one or more embodiments of the present application increase a voltage division sampling circuit and use an adjustable voltage division method to make a low-voltage linear voltage regulated circuit operate in a high-voltage circuit, thereby utilizing the low ripple and low noise characteristics of the low-voltage linear voltage regulated circuit and expanding the operating voltage range of the low-voltage linear voltage regulated circuit.

[0018] The linear voltage-stabilized power supply circuit and the electronic product of one or more embodiments of the present application can make the output voltage of the low-voltage linear voltage-stabilized circuit adjustable by introducing an adjustable control circuit.

[0019] The linear voltage-stabilized power supply circuit and the electronic product of one or more embodiments of the present application can greatly expand the output capacity of the low-voltage linear voltage-stabilized circuit by adding a current expansion circuit, and can provide a large current output. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural block diagram of a linear voltage-regulated power supply circuit according to an embodiment of the present application.

[0021] Figure 2 A circuit diagram of a linear voltage-regulated power supply circuit according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] 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, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0023] The linear voltage regulated power supply circuit and the electronic product of each embodiment of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0024] Figure 1 The structure block diagram of a linear voltage regulated power supply circuit 100 according to an embodiment of the present application is disclosed. Figure 2 The circuit diagram of a linear voltage regulated power supply circuit 100 according to an embodiment of the present application is disclosed. Figure 1 and Figure 2 As shown, a linear voltage regulated power supply circuit 100 according to an embodiment of the present application includes a low voltage linear voltage regulated circuit 110 and a voltage division sampling circuit 120 .

[0025] The low voltage linear voltage regulator circuit 110 is the core circuit of the linear voltage regulator power supply circuit 100. The low voltage linear voltage regulator circuit 110 can use a commercial linear voltage regulator power supply chip or a circuit built with discrete components. In one embodiment of the present application, the low voltage linear voltage regulator circuit 110 is a circuit built with discrete components to facilitate simulation.

[0026] The low voltage linear voltage regulator circuit 110 has an input terminal, an output terminal and a regulating terminal. In some embodiments, the low voltage linear voltage regulator circuit 110 of the present application includes a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3 and a first voltage regulator tube D1.

[0027] The base of the first transistor Q1 is connected to the collector of the second transistor Q2, the collector of the first transistor Q1 serves as the input end of the low voltage linear voltage regulator circuit 110, and the emitter of the first transistor Q1 serves as the output end of the low voltage linear voltage regulator circuit 110. The first transistor Q1 serves as a power adjustment tube and outputs current.

[0028] The first resistor R1 is connected between the base and collector of the first transistor Q1; the second resistor R2 is connected between the emitter of the first transistor Q1 and the base of the second transistor Q2; the third resistor R3 is connected between the base of the second transistor Q2 and the regulating end of the low-voltage linear voltage regulator circuit 110. The second resistor R2 and the third resistor R3 are used to sample the divided voltage of the output voltage Vo of the low-voltage linear voltage regulator circuit 110 to regulate the base voltage of the second transistor Q2. The first resistor R1 is used to provide a static operating point of the second transistor Q2.

[0029] The anode of the first voltage regulator D1 is connected to the regulating end of the low voltage linear voltage regulator circuit 110, and the cathode of the first voltage regulator D1 is connected to the emitter of the second transistor Q2. The first voltage regulator D1 is used to provide a minimum stable voltage.

[0030] When the output voltage Vo of the low-voltage linear voltage regulator circuit 110 increases, the voltage sampled and divided by the second resistor R2 and the third resistor R3 increases, and the base voltage of the second transistor Q2 increases. According to the transistor characteristics, the current flowing through the second transistor Q2 increases, and the base voltage of the first transistor Q1 decreases, and the output voltage Vo of the low-voltage linear voltage regulator circuit 110 decreases, so that the output voltage Vo of the low-voltage linear voltage regulator circuit 110 can be ultimately kept unchanged, and the stability of the output voltage Vo can be maintained.

[0031] The voltage-dividing sampling circuit 120 is connected between the input voltage source V1 and the low-voltage linear voltage regulator circuit 110, and the voltage-dividing sampling circuit 120 may include a first resistor network and a third transistor Q3. The first resistor network is used to limit the current flowing into the low-voltage linear voltage regulator circuit 110 and provide a static operating point of the third transistor Q3; the third transistor Q3 is used to share the voltage drop between the input voltage source V1 and the low-voltage linear voltage regulator circuit 110.

[0032] In some embodiments, the first resistor network may include a fourth resistor R4, a sixth resistor R6, and a seventh resistor R7.

[0033] The fourth resistor R4 is connected between the collector of the third transistor Q3 and the input voltage source V1 to limit the current flowing into the low voltage linear voltage regulator circuit 110. The emitter of the third transistor Q3 is connected to the input end of the low voltage linear voltage regulator circuit 110.

[0034] The sixth resistor R6 is connected between the base of the third transistor Q3 and the input voltage source V1, and the seventh resistor R7 is connected between the base of the third transistor Q3 and the regulating end of the low voltage linear voltage regulator circuit 110. The sixth resistor R6 and the seventh resistor R7 are used to provide a static operating point of the third transistor Q3.

[0035] In some embodiments, the linear voltage regulator circuit 100 of the present application may further include an adjustable control circuit 130. The adjustable control circuit 130 is connected to the output end of the low voltage linear voltage regulator circuit 110 and is used to adjust the output voltage Vo of the low voltage linear voltage regulator circuit 110 based on the reference voltage input source V2.

[0036] In some embodiments, the adjustable control circuit 130 of the present application may include an error amplifier circuit and a second resistor network. The error amplifier circuit is used to connect to the reference voltage input source V2 to adjust the output voltage Vo of the low-voltage linear voltage regulator circuit 110; the second resistor network is used to sample the signal size of the output voltage Vo of the low-voltage linear voltage regulator circuit 110 and provide the working point of the error amplifier circuit.

[0037] In some embodiments, the error amplifier circuit may include an operational amplifier U, a first power source V3, a second power source V4, a fourth transistor Q4, an eighth resistor R8, a ninth resistor R9 and a first capacitor C1.

[0038] The non-inverting input terminal of the operational amplifier U is connected to the second resistor network, and the inverting input terminal of the operational amplifier U is connected to the reference voltage input source V2 and connected to the output terminal of the operational amplifier U through the first capacitor C1. The first capacitor C1 is used as an integrator to amplify the voltage difference between the feedback voltage and the reference voltage input source V2. The reference voltage input source V2 can be generated by an external signal source or a digital-to-analog converter (DAC).

[0039] The first power source V3 and the second power source V4 are respectively connected to the operational amplifier U as auxiliary positive and negative power sources, so that the operational amplifier U can work normally.

[0040] The base of the fourth transistor Q4 is connected to the output end of the operational amplifier U through the eighth resistor R8, and the eighth resistor R8 is used to limit the current flowing into the base of the fourth transistor Q4; the collector of the fourth transistor Q4 is connected to the output end of the low-voltage linear voltage regulator circuit 110 through the ninth resistor R9, and the ninth resistor R9 is used to provide a static operating point of the fourth transistor Q4; the emitter of the fourth transistor Q4 is grounded.

[0041] In some embodiments, the second resistor network includes a tenth resistor R10 and an eleventh resistor R11 connected in series.

[0042] The tenth resistor R10 and the eleventh resistor R11 are connected in series between the output terminal of the low voltage linear voltage regulator circuit 110 and the ground, and the non-inverting input terminal of the operational amplifier U is connected between the tenth resistor R10 and the eleventh resistor R11. The tenth resistor R10 and the eleventh resistor R11 sample the final adjustable output voltage Vo and feed it back through the non-inverting input terminal of the operational amplifier U.

[0043] After the voltage of the reference voltage input source V2 is set, when the adjustable output voltage Vo of the low-voltage linear voltage regulator circuit 110 becomes higher, the voltage of the sampled voltage divided by the tenth resistor R10 and the eleventh resistor R11 becomes higher, the voltage at the non-inverting input terminal of the operational amplifier U becomes higher, the output voltage Vo of the operational amplifier U becomes higher, the current flowing into the base of the fourth transistor Q4 becomes larger, the voltage difference between the emitter and the collector of the fourth transistor Q4 decreases, and the reference ground voltage of the low-voltage linear voltage regulator circuit 110 decreases. Therefore, the adjustable output voltage Vo of the low-voltage linear voltage regulator circuit 110 decreases.

[0044] In some embodiments, the linear voltage regulated power supply circuit 100 of the present application may further include a current expansion circuit 140. The first resistor network in the voltage division sampling circuit 120 further includes a fifth resistor R5 connected in series with the fourth resistor R4, and the fourth resistor R4 and the fifth resistor R5 are used to jointly limit the current flowing into the low voltage linear voltage regulated circuit 110.

[0045] The current expansion circuit 140 is connected between the fourth resistor R4 and the fifth resistor R5 in the voltage division sampling circuit 120 . The fourth resistor R4 is used to sample the current flowing into the low voltage linear voltage regulator circuit 110 to control the operating point of the current expansion circuit 140 .

[0046] The current expansion circuit 140 is also connected to the output end of the low voltage linear voltage regulator circuit 110, and is used to increase the output current of the output end of the low voltage linear voltage regulator circuit 110, so as to provide a large current output.

[0047] Optionally, the current expansion circuit 140 may include a common collector amplifier circuit, which is composed of one or more power devices connected in parallel.

[0048] In some embodiments, the current expansion circuit 140 includes a fifth transistor Q5 , a sixth transistor Q6 , a twelfth resistor R12 , and a thirteenth resistor R13 .

[0049] The base of the fifth transistor Q5 is connected to the collector of the sixth transistor Q6 and connected to the regulating end of the low-voltage linear voltage regulator circuit 110 through the twelfth resistor R12, the collector of the fifth transistor Q5 is connected to the emitter of the sixth transistor Q6 and connected to the input voltage source V1, and the emitter of the fifth transistor Q5 is connected to the output end of the low-voltage linear voltage regulator circuit 110. Optionally, the fifth transistor Q5 may include an NPN Darlington transistor to reduce the demand for base current, and the fifth transistor Q5 may act as a power transistor and provide a large current output.

[0050] The base of the sixth transistor Q6 is connected between the fourth resistor R4 and the fifth resistor R5 through the thirteenth resistor R13. The sixth transistor Q6 can be, for example, a PNP transistor. The thirteenth resistor R13 is used to limit the current flowing into the base of the sixth transistor Q6. By sampling the voltage of the fourth resistor R4 in the voltage-dividing sampling circuit 120, a simple current source circuit is formed. The twelfth resistor R12 provides a flow loop.

[0051] When the current of the adjustable output voltage Vo of the low voltage linear voltage regulator circuit 110 increases, the current flowing through the fourth resistor R4 in the voltage-dividing sampling circuit 120 increases, the base voltage of the sixth transistor Q6 decreases, the current flowing through the sixth transistor Q6 increases, the base voltage of the fifth transistor Q5 increases, and the base current flowing into the fifth transistor Q5 increases, so that the output capacity of the fifth transistor Q5 increases. Thus, a large current output can be provided.

[0052] The linear voltage-regulated power supply circuit 100 of the present application can meet the requirements of high voltage, high current and low ripple, and solves the problems of low output current and unadjustable output voltage of high voltage power supply in the prior art.

[0053] Of course, it is understandable that in other embodiments, in order to ensure that the linear voltage-regulated power supply circuit 100 of the present application can work better, the linear voltage-regulated power supply circuit 100 of the present application may also include auxiliary modules such as a heat dissipation module, a protection module and / or a loop stability compensation module. However, the linear voltage-regulated power supply circuit 100 of the present application does not limit these auxiliary modules, and they can be appropriately increased or decreased according to actual circuit application requirements.

[0054] For example, the resistance ratio of the tenth resistor R10 and the eleventh resistor R11 is set to 39:1, the gain coefficient is 40, the load resistor Ro is 500 ohms, and the input voltage source V1 is 120V. Figure 2 The linear voltage regulated power supply circuit 100 shown in FIG. 1 is simulated by Multisim. When the reference voltage input source V2 is 1V, the Figure 2 The adjustable output voltage Vo of the linear voltage-regulated power supply circuit 100 shown in the figure is 40V; when the reference voltage input source V2 is 2.5V, the Figure 2 The adjustable output voltage Vo of the linear voltage-regulated power supply circuit 100 shown is 100 V. Therefore, it can be seen from the above simulation that the linear voltage-regulated power supply circuit 100 of the present application can adjust the magnitude of the output voltage Vo according to the magnitude of the voltage of the reference voltage input source V2 by adding the adjustable control circuit 130, thereby realizing the adjustable output voltage Vo of the linear voltage-regulated power supply circuit 100 of the present application.

[0055] The present application also provides an electronic product, which includes the linear voltage-regulated power supply circuit 100 as described in the above embodiments.

[0056] The linear voltage regulated power supply circuit 100 and the electronic product of one or more embodiments of the present application increase the voltage division sampling circuit 120, and use the adjustable voltage division method to make the low voltage linear voltage regulated circuit 110 work in the high voltage circuit, thereby utilizing the low ripple and low noise characteristics of the low voltage linear voltage regulated circuit 110 and expanding the working voltage range of the low voltage linear voltage regulated circuit 110.

[0057] The linear voltage regulated power supply circuit 100 and the electronic product of one or more embodiments of the present application can make the output voltage Vo of the low voltage linear voltage regulated circuit 110 adjustable by introducing the adjustable control circuit 130 .

[0058] The linear voltage regulated power supply circuit 100 and the electronic product of one or more embodiments of the present application can greatly expand the output capacity of the low-voltage linear voltage regulated circuit 110 by adding the current expansion circuit 140, and can provide a large current output.

[0059] The above has introduced in detail the linear voltage regulator power supply circuit and electronic product provided by the embodiments of the present application. Specific examples are used in this text to elaborate on the linear voltage regulator power supply circuit and electronic product of the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of the present application and is not intended to limit the present application. It should be noted that for those of ordinary skill in the art, without departing from the spirit and principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the protection scope of the appended claims of the present application.

Claims

1. A linear voltage-regulated power supply circuit, characterized in that: It includes a low-voltage linear voltage stabilization circuit and a voltage-dividing sampling circuit, wherein the voltage-dividing sampling circuit is connected between an input voltage source and the low-voltage linear voltage stabilization circuit, and the voltage-dividing sampling circuit includes a first resistor network and a third triode, wherein: The first resistor network is used to limit the current flowing into the low voltage linear voltage stabilization circuit and provide a static operating point of the third transistor; The third transistor is used to share the voltage drop between the input voltage source and the low-voltage linear voltage stabilization circuit.

2. The linear voltage-regulated power supply circuit according to claim 1, characterized in that: The low voltage linear voltage stabilization circuit has an input terminal, an output terminal and an adjustment terminal, and the first resistor network includes a fourth resistor, a sixth resistor and a seventh resistor, wherein: The fourth resistor is connected between the collector of the third transistor and the input voltage source; the sixth resistor is connected between the base of the third transistor and the input voltage source, and the seventh resistor is connected between the base of the third transistor and the regulating end of the low-voltage linear voltage regulator circuit; The emitter of the third transistor is connected to the input end of the low-voltage linear voltage stabilizing circuit.

3. The linear voltage-regulated power supply circuit according to claim 1, characterized in that: The low voltage linear voltage stabilizing circuit comprises a first triode, a second triode, a first resistor, a second resistor, a third resistor and a first voltage stabilizing tube, wherein: The base of the first transistor is connected to the collector of the second transistor, the collector of the first transistor serves as the input end of the low-voltage linear voltage regulator circuit, and the emitter of the first transistor serves as the output end of the low-voltage linear voltage regulator circuit; The first resistor is connected between the base and the collector of the first transistor; The second resistor is connected between the emitter of the first transistor and the base of the second transistor; The third resistor is connected between the base of the second transistor and the regulating end of the low-voltage linear voltage stabilizing circuit; The anode of the first voltage regulator tube is connected to the regulating end of the low-voltage linear voltage regulator circuit, and the cathode of the first voltage regulator tube is connected to the emitter of the second transistor.

4. The linear voltage-regulated power supply circuit according to claim 1, wherein: It also includes an adjustable control circuit, wherein the adjustable control circuit is connected to the output end of the low-voltage linear voltage regulator circuit and is used to adjust the output voltage of the low-voltage linear voltage regulator circuit based on a reference voltage input source.

5. The linear voltage-regulated power supply circuit according to claim 4, characterized in that: The adjustable control circuit includes an error amplifier circuit and a second resistor network, wherein: The error amplifier circuit is used to be connected to the reference voltage input source and is used to adjust the output voltage of the low voltage linear voltage regulator circuit; The second resistor network is used to sample the signal size of the output voltage of the low-voltage linear voltage regulator circuit and provide the operating point of the error amplifier circuit.

6. The linear voltage-regulated power supply circuit according to claim 5, characterized in that: The error amplification circuit includes an operational amplifier, a first power supply, a second power supply, a fourth transistor, an eighth resistor, a ninth resistor and a first capacitor, wherein: The non-inverting input terminal of the operational amplifier is connected to the second resistor network, and the inverting input terminal of the operational amplifier is connected to the reference voltage input source and connected to the output terminal of the operational amplifier through the first capacitor; The first power supply and the second power supply are connected to the operational amplifier as positive and negative power supplies respectively; The base of the fourth transistor is connected to the output end of the operational amplifier through the eighth resistor, the collector of the fourth transistor is connected to the output end of the low-voltage linear voltage regulator circuit through the ninth resistor, and the emitter of the fourth transistor is grounded.

7. The linear voltage-regulated power supply circuit according to claim 6, characterized in that: The second resistor network includes a tenth resistor and an eleventh resistor connected in series, wherein: The tenth resistor and the eleventh resistor are connected in series between the output end of the low voltage linear voltage stabilizing circuit and the ground. The non-inverting input terminal of the operational amplifier is connected between the tenth resistor and the eleventh resistor.

8. The linear voltage-regulated power supply circuit according to claim 2, characterized in that: The first resistor network further includes a fifth resistor connected in series with the fourth resistor, and the fourth resistor and the fifth resistor are used to limit the current flowing into the low voltage linear voltage stabilization circuit. The linear voltage-regulated power supply circuit also includes a current expansion circuit, wherein: The current expansion circuit is connected between the fourth resistor and the fifth resistor in the voltage division sampling circuit, and the fourth resistor is used to sample the current flowing into the low voltage linear voltage stabilization circuit to control the working point of the current expansion circuit; The current expansion circuit is also connected to the output end of the low-voltage linear voltage stabilizing circuit, and is used to increase the output current of the output end of the low-voltage linear voltage stabilizing circuit.

9. The linear voltage-regulated power supply circuit according to claim 8, characterized in that: The current expansion circuit includes a common collector amplifier circuit, and the common collector amplifier circuit is composed of one or more power devices connected in parallel.

10. The linear voltage-regulated power supply circuit according to claim 8, characterized in that: The current expansion circuit includes a fifth transistor, a sixth transistor, a twelfth resistor and a thirteenth resistor, wherein: The base of the fifth transistor is connected to the collector of the sixth transistor and connected to the regulating end of the low-voltage linear voltage regulator circuit through the twelfth resistor, the collector of the fifth transistor is connected to the emitter of the sixth transistor and connected to the input voltage source, and the emitter of the fifth transistor is connected to the output end of the low-voltage linear voltage regulator circuit; The base of the sixth transistor is connected between the fourth resistor and the fifth resistor through the thirteenth resistor.

11. The linear voltage-regulated power supply circuit according to claim 10, characterized in that: The fifth transistor includes an NPN Darlington transistor.

12. An electronic product, characterized in that: The invention comprises the linear voltage regulated power supply circuit as claimed in any one of claims 1 to 11.

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