Low-dropout voltage stabilizing circuit
By simplifying the voltage stabilization circuit design of the circuit structure, using components such as PNP transistors, NPN transistors and voltage stabilization diodes, the problems of large power consumption and high cost of traditional low-dropout linear voltage stabilization circuits are solved, and low dropout voltage stabilization and low power loss are achieved.
Patent Information
- Application Number
- CN202422402430.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The circuit structure of the traditional low-dropout linear voltage stabilization circuit is complex, has high production costs, and consumes a lot of power.
The voltage stabilization circuit design is adopted that includes a first switch, a second switch and a regulation circuit. The difference between the input voltage and the output voltage is adjusted by controlling the control signal to achieve low dropout voltage stabilization. The circuit structure is simplified by electronic components such as PNP transistors, NPN transistors and voltage stabilization diodes.
It achieves low dropout voltage stabilization, low power loss and reduced production costs.
Smart Images
Figure CN223193304U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply, in particular to a low voltage difference voltage stabilizing circuit. Background Art
[0002] A low dropout regulator (LDO) circuit is a step-down DC linear voltage regulator. It is widely used in industries such as computers, communications, instrumentation, consumer electronics, and video surveillance.
[0003] Linear voltage regulators are used to provide a stable voltage. Traditional voltage regulators require the input voltage to be at least 2V to 3V higher than the output voltage; otherwise, they will not function properly. However, some chips and circuits in portable electronic devices require a voltage regulator with a smaller voltage difference between the input and output voltages. Furthermore, because the input voltage of traditional voltage regulators is much higher than the output voltage, they consume a lot of power. Therefore, a low-voltage-dropout voltage regulator circuit is needed.
[0004] Traditional low voltage difference linear voltage regulator circuits have certain disadvantages, such as complex circuit structure and high production cost, which leads to high prices. Utility Model Content
[0005] The purpose of the utility model is to provide a low voltage difference voltage stabilizing circuit with a simple circuit structure, which can reduce production costs. Since the voltage difference between the input voltage and the output voltage is low, the power loss is low.
[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0007] In one aspect of an embodiment of the present invention, a low-voltage-difference voltage-stabilizing circuit is provided, which includes: a first switch, wherein a first end of the first switch is connected to an input power supply, a second end of the first switch outputs a power supply, and the output is increased when the control signal received by the controlled end of the first switch is a low-level signal, and the output is reduced when the control signal received is a high-level signal; a second switch, wherein the controlled end of the first switch is connected to the first end of the second switch, the second end of the second switch is connected to the input power supply, and the third end of the second switch is grounded; a regulating circuit, wherein a first end of the regulating circuit is connected to the controlled end of the second switch, the second end of the regulating circuit is connected to the input power supply, and the controlled end of the regulating circuit is connected to the second end of the first switch; when the voltage signal received by the controlled end of the regulating circuit is lower than a first set value, the second switch is controlled to reduce the control signal; when the voltage signal received by the controlled end of the regulating circuit is higher than a second set value, the second switch is controlled to increase the control signal.
[0008] In some embodiments, the first switch uses a PNP transistor, the emitter of the PNP transistor is connected to the input power supply, the collector of the PNP transistor outputs the power supply, and the base of the PNP transistor is connected to the first end of the second switch.
[0009] In some embodiments, the second switch includes an NPN transistor, a first resistor and a second resistor, the collector of the NPN transistor is connected to one end of the first resistor and the base of the PNP transistor, the other end of the first resistor is connected to the input power supply, the emitter of the NPN transistor is grounded through the second resistor, and the base of the NPN transistor is connected to the first end of the regulation circuit.
[0010] In some embodiments, the regulation circuit includes a voltage regulator diode, a third resistor, a fourth resistor and a fifth resistor, the cathode of the voltage regulator diode is connected to the base of the NPN transistor and one end of the third resistor, the other end of the third resistor is connected to the input power supply, the reference end of the voltage regulator diode is connected to one end of the fourth resistor and one end of the fifth resistor, the other end of the fourth resistor is connected to the collector of the PNP transistor, and the anode of the voltage regulator diode and the other end of the fifth resistor are grounded.
[0011] In some embodiments, the voltage stabilizing circuit further includes a fourth capacitor, one end of the fourth capacitor is connected to the cathode of the voltage stabilizing diode, and the other end of the fourth capacitor is connected to one end of the fourth resistor and the reference end of the voltage stabilizing diode.
[0012] In some embodiments, the voltage stabilization circuit further includes a seventh capacitor, one end of the seventh capacitor is connected to the power supply, and the other end of the seventh capacitor is grounded.
[0013] A low-voltage-dropout voltage-stabilizing circuit according to an embodiment of the present invention has at least the following beneficial effects: Conventional voltage-stabilizing circuits require a voltage difference between the input and output voltages of at least 2V to 3V, resulting in high power consumption. However, the voltage-stabilizing circuit of the present invention has a voltage difference between the input and output voltages of at least 0.1V, resulting in a much lower voltage difference and lower power consumption than conventional voltage-stabilizing circuits. Furthermore, compared to conventional low-voltage-dropout linear voltage-stabilizing circuits, the circuit structure of the present invention is simple, enabling lower production costs.
[0014] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0016] Figure 1 2 is a schematic diagram of a voltage stabilizing circuit according to an embodiment.
[0017] The description of the accompanying figures is as follows: 1. Second switch; 2. Adjustment circuit. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0019] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.
[0020] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0021] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this disclosure will be more comprehensive and complete, and will fully convey the concepts of the example embodiments to those skilled in the art. The accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures indicate identical or similar parts, and thus repeated descriptions thereof will be omitted.
[0022] The technical solutions of the embodiments of the present application are briefly described below:
[0023] According to some embodiments, Figure 1 As shown, the present application provides a low voltage difference voltage stabilizing circuit, the voltage stabilizing circuit comprising:
[0024] a first switch QP, wherein a first end of the first switch QP is connected to an input power supply, a second end of the first switch QP outputs a power supply VCC, and the output of the first switch QP is increased when the control signal 100 received by the controlled end is a low-level signal, and the output is decreased when the control signal 100 received is a high-level signal;
[0025] a second switch 1, wherein the controlled terminal of the first switch QP is connected to the first terminal of the second switch 1, the second terminal of the second switch 1 is connected to the input power supply, and the third terminal of the second switch 1 is grounded;
[0026] The regulating circuit 2 has a first terminal connected to the controlled terminal of the second switch 1 , a second terminal connected to the input power supply, and a controlled terminal connected to the second terminal of the first switch QP.
[0027] Based on the working principle of the above embodiment, when the voltage signal received by the controlled end of the regulation circuit 2 is lower than the first set value, that is, when the voltage of the power supply VCC output by the second end of the first switch QP is lower than the first set value, the regulation circuit 2 controls the second switch 1 to lower the voltage of the control signal 100, so that the first switch QP increases its output.
[0028] When the voltage signal received by the controlled end of the regulation circuit 2 is higher than the second set value, that is, when the voltage of the power supply VCC output by the second end of the first switch QP is higher than the second set value, the regulation circuit 2 controls the second switch 1 to increase the voltage of the control signal 100, so that the first switch QP reduces its output.
[0029] The first set value and the second set value can be set according to actual needs.
[0030] The following is in conjunction with the appendix of this manual Figure 1 , the preferred embodiments of the present disclosure are further elaborated in detail.
[0031] In some preferred embodiments, Figure 1 As shown, the first switch QP uses a PNP transistor QP, the emitter of the PNP transistor QP is connected to the input power supply, the collector of the PNP transistor QP outputs the power supply VCC, and the base of the PNP transistor QP is connected to the first end of the second switch 1.
[0032] In other embodiments, the first switch QP may also be a PMOS tube, an optocoupler or other electronic components, which is not limited in this application.
[0033] Further, such as Figure 1 As shown, the second switch 1 includes an NPN transistor QN, a first resistor R1 and a second resistor R2. The collector of the NPN transistor QN is connected to one end of the first resistor R1 and the base of the PNP transistor QP. The other end of the first resistor R1 is connected to the input power supply. The emitter of the NPN transistor QN is grounded through the second resistor R2. The base of the NPN transistor QN is connected to the first end of the regulation circuit 2.
[0034] Among them, in other embodiments, the NPN transistor QN can also be replaced by electronic components such as NMOS tubes and optocouplers, which is not limited in this application.
[0035] Further, such as Figure 1 As shown, the regulation circuit 2 includes a Zener diode U3, a third resistor R3, a fourth resistor R4 and a fifth resistor R5. The cathode of the Zener diode U3 is connected to the base of the NPN transistor QN and one end of the third resistor R3, the other end of the third resistor R3 is connected to the input power supply, the reference end of the Zener diode U3 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the fourth resistor R4 is connected to the collector of the PNP transistor QP, and the anode of the Zener diode U3 and the other end of the fifth resistor R5 are grounded.
[0036] Among them, the voltage stabilizing diode U3 adopts TL431.
[0037] Based on the operating principle of the above embodiment, the power supply VCC output from the collector of the PNP transistor QP is divided by the fourth resistor R4 and the fifth resistor R5, and then output to the reference terminal of the voltage-stabilizing diode U3 for feedback regulation. When the voltage of the power supply VCC output from the collector of the PNP transistor QP falls below a first set value, the voltage-stabilizing diode U3 reduces its output, and the base of the NPN transistor QN receives a high-level signal through the third resistor R3, causing the NPN transistor QN to increase its output, thereby lowering the control signal 100 at the base of the PNP transistor QP, causing the PNP transistor QP to increase its output.
[0038] When the voltage of the power supply VCC output by the collector of the PNP transistor QP is higher than the second set value, the voltage regulator diode U3 increases the output, pulls down the electrical signal at the base of the NPN transistor QN, and the NPN transistor QN reduces the output. The control signal 100 at the base of the PNP transistor QP is pulled up by the first resistor R1, and the PNP transistor QP reduces the output.
[0039] Traditional voltage-stabilizing circuits require a voltage difference of at least 2V to 3V between the input and output voltages, resulting in high power consumption. However, the voltage-stabilizing circuit of the present application requires a voltage difference of at least 0.1V between the input and output voltages, resulting in a much lower voltage difference and lower power consumption than traditional voltage-stabilizing circuits. Furthermore, compared to traditional low-voltage-dropout linear voltage-stabilizing circuits, the circuit structure of the present application is simple, which can reduce the production cost of the circuit.
[0040] Further, such as Figure 1 As shown, the voltage stabilizing circuit further includes a fourth capacitor, one end of the fourth capacitor is connected to the cathode of the voltage stabilizing diode U3, and the other end of the fourth capacitor is connected to one end of the fourth resistor R4 and the reference end of the voltage stabilizing diode U3.
[0041] The fourth capacitor is used for negative feedback to prevent flyback.
[0042] Further, such as Figure 1 As shown, the voltage stabilizing circuit further includes a seventh capacitor, one end of the seventh capacitor is connected to the power supply VCC, and the other end of the seventh capacitor is grounded.
[0043] The seventh capacitor is used to filter the power supply VCC output from the collector of the PNP transistor QP.
[0044] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.
[0045] While the present disclosure has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present disclosure can be embodied in various forms without departing from the spirit or substance of the application, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.
Claims
1. A low voltage difference voltage stabilizing circuit, characterized in that: The voltage stabilizing circuit comprises: a first switch, wherein a first end of the first switch is connected to an input power supply, a second end of the first switch outputs a power supply, and a controlled end of the first switch increases an output when a control signal received is a low-level signal and decreases an output when a control signal received is a high-level signal; a second switch, wherein a controlled end of the first switch is connected to a first end of the second switch, a second end of the second switch is connected to an input power supply, and a third end of the second switch is grounded; a regulating circuit, wherein a first end of the regulating circuit is connected to the controlled end of the second switch, a second end of the regulating circuit is connected to an input power supply, and the controlled end of the regulating circuit is connected to the second end of the first switch; When the voltage signal received by the controlled end of the regulating circuit is lower than a first set value, controlling the second switch to reduce the control signal; When the voltage signal received by the controlled end of the regulating circuit is higher than a second set value, the second switch is controlled to increase the control signal.
2. The voltage stabilizing circuit according to claim 1, wherein: The first switch adopts a PNP transistor, the emitter of the PNP transistor is connected to the input power supply, the collector of the PNP transistor outputs the power supply, and the base of the PNP transistor is connected to the first end of the second switch.
3. The voltage stabilizing circuit according to claim 2, wherein: The second switch includes an NPN transistor, a first resistor and a second resistor, the collector of the NPN transistor is connected to one end of the first resistor and the base of the PNP transistor, the other end of the first resistor is connected to the input power supply, the emitter of the NPN transistor is grounded through the second resistor, and the base of the NPN transistor is connected to the first end of the regulation circuit.
4. The voltage stabilizing circuit according to claim 3, wherein: The regulation circuit includes a voltage regulator diode, a third resistor, a fourth resistor and a fifth resistor. The cathode of the voltage regulator diode is connected to the base of the NPN transistor and one end of the third resistor, the other end of the third resistor is connected to the input power supply, the reference end of the voltage regulator diode is connected to one end of the fourth resistor and one end of the fifth resistor, the other end of the fourth resistor is connected to the collector of the PNP transistor, and the anode of the voltage regulator diode and the other end of the fifth resistor are grounded.
5. The voltage stabilizing circuit according to claim 4, wherein: The voltage stabilizing circuit further includes a fourth capacitor, one end of the fourth capacitor is connected to the cathode of the voltage stabilizing diode, and the other end of the fourth capacitor is connected to one end of the fourth resistor and the reference end of the voltage stabilizing diode.
6. The voltage stabilizing circuit according to claim 1, wherein: The voltage stabilizing circuit further includes a seventh capacitor, one end of the seventh capacitor is connected to the power supply, and the other end of the seventh capacitor is grounded.