Novel step-down circuit
By using amplifiers and voltage boosting modules in the buck circuit to improve the opening degree of the power adjustment tube, the problem of complex design when the voltage variation range of the external power supply in the prior art is solved, and a stable and low-cost voltage output is achieved, which expands the Application voltage range.
Patent Information
- Application Number
- CN202421049911.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-05-15
AI Technical Summary
Existing step-down circuits are complex in design when facing a wide range of external supply voltage variations, making it difficult to achieve stable and reliable low voltage outputs, especially when generating higher internal power supplies.
A new type of buck circuit is designed, including input power supply, voltage reference, and voltage output. The voltage at Node B is sampled by the negative end of the amplifier and the voltage reference. The voltage boosting module is used to increase the output voltage of the amplifier. At the gate end of the power adjustment tube, the opening degree of the power adjustment tube is increased, thereby achieving an increase in the voltage output and stabilizing the voltage output through the alternating charging process of capacitors and switches.
The method of generating a large internal power supply through a small internal power supply is realized, which expands the application voltage range, reduces costs, and has a simple structure.
Smart Images
Figure CN222189774U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of step-down circuits, in particular to a novel step-down circuit. Background Art
[0002] A buck circuit is a circuit that can reduce the input voltage to a lower voltage level. It converts a high voltage source or signal into a low voltage output through effective voltage conversion and regulation technology. The buck circuit usually contains power components (such as inductors, diodes, switching devices, etc.), control circuits and feedback loops to achieve a stable and reliable output voltage.
[0003] Usually there is more than one internal power supply inside a chip. It is relatively simple to use the existing internal power supply to generate a smaller internal power supply design. If you want to generate a power supply design with a higher voltage than the existing internal power supply, it will be very complicated. When the voltage variation range of the external power supply is very wide, the design will be more difficult. Utility Model Content
[0004] The utility model aims to solve the shortcomings in the prior art and proposes a new type of step-down circuit.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new step-down circuit, including an input power supply, a voltage reference, and a voltage output, wherein the input power supply is connected to a power adjustment tube, one end of the power adjustment tube is connected to a voltage boosting module, the voltage boosting module is connected to an amplifier, one end of the amplifier is connected to resistor 1, the resistor 1 is connected to ground, one end of the power adjustment tube is connected to resistor 2, and the resistor 2 is connected to one end of resistor 1.
[0006] As a further description of the above technical solution:
[0007] The voltage boosting module includes an internal power supply, the internal power supply is connected to resistor three, the resistor three is connected to resistor four, the resistor four is connected to resistor five, the resistor five is grounded, one end of the resistor three is connected to switch one, the switch one is connected in series with switch three, the switch three is connected in series with capacitor one, the capacitor one is connected in series with switch four, the switch four is connected in series with switch two, the switch two is connected to one end of the resistor five, one end of the switch one is connected to capacitor two, and the capacitor two is connected to one end of the switch two.
[0008] As a further description of the above technical solution:
[0009] One end of the amplifier is connected to a voltage reference.
[0010] As a further description of the above technical solution:
[0011] One end of the power adjustment tube is connected to the voltage output.
[0012] As a further description of the above technical solution:
[0013] One end of the capacitor is connected to the amplifier.
[0014] As a further description of the above technical solution:
[0015] One end of the power adjustment tube is connected to capacitor 1.
[0016] As a further description of the above technical solution:
[0017] A node B is formed at the connection between the resistor 1 and the resistor 2.
[0018] The utility model has the following beneficial effects:
[0019] 1. In the utility model, the voltage at the node B is sampled through the negative end of the amplifier, and compared with the voltage reference, the output voltage of the amplifier is raised by a voltage V1 through the voltage boost module to act on the gate end of the power adjustment tube. The gate end voltage of the power adjustment tube increases, the power adjustment tube is turned on to a greater extent, the potential of the voltage output increases, and the potential of the node B also increases. When the voltage of the node B is equal to the voltage reference, the voltage output stabilizes and no longer increases. A method of generating a large internal power supply through a small internal power supply has a simple structure, so that the voltage range of application is wider and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a structural diagram of a novel step-down circuit proposed by the utility model;
[0021] Figure 2 This is a voltage reduction principle diagram of a novel voltage reduction circuit proposed by the utility model;
[0022] Figure 3 This is a partial schematic diagram of a novel step-down circuit proposed by the utility model;
[0023] Figure 4 This is a phase relationship diagram of control signals of switch 1, switch 2, switch 3 and switch 4 in a novel step-down circuit proposed by the utility model.
[0024] Legend:
[0025] 1. Input power supply; 2. Power adjustment tube; 3. Voltage boost module; 4. Amplifier; 5. Resistor 1; 6. Grounding; 7. Resistor 2; 8. Internal power supply; 9. Resistor 3; 10. Resistor 4; 11. Resistor 5; 12. Switch 1; 13. Switch 3; 14. Capacitor 1; 15. Switch 4; 16. Switch 2; 17. Capacitor 2; 18. Voltage reference; 19. Voltage output. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] Reference Figure 1-Figure 4 The utility model provides an embodiment: a novel step-down circuit, including an input power supply 1, a voltage reference 18, and a voltage output 19. The input power supply 1 is connected to a power adjustment tube 2, one end of the power adjustment tube 2 is connected to a voltage boosting module 3, the voltage boosting module 3 is connected to an amplifier 4, one end of the amplifier 4 is connected to a resistor 1 5, the resistor 1 5 is connected to a ground 6, one end of the power adjustment tube 2 is connected to a resistor 2 7, the resistor 2 7 is connected to one end of the resistor 1 5, the voltage at the node B is sampled through the negative end of the amplifier 4, and compared with the voltage reference 18, the output voltage of the amplifier 4 is raised by a voltage V1 through the voltage boosting module 3 to act on the gate end of the power adjustment tube 2, the gate end voltage of the power adjustment tube 2 is increased, the opening degree of the power adjustment tube 2 is greater, the potential of the voltage output 19 is increased, and the potential of the node B is also increased. When the voltage of the node B is equal to the voltage reference 18, the voltage output 19 is stabilized and no longer increases. The method of generating a large internal power supply 8 through a small internal power supply 8 has a simple structure, so that the voltage range of application is wider and the cost is low.
[0028] The voltage boost module 3 includes an internal power supply 8, the internal power supply 8 is connected to a resistor 3 9, the resistor 3 9 is connected to a resistor 4 10, the resistor 4 10 is connected to a resistor 5 11, the resistor 5 11 is connected to the ground 6, one end of the resistor 3 9 is connected to a switch 12, the switch 1 12 is connected in series with a switch 3 13, the switch 3 13 is connected in series with a capacitor 14, the capacitor 14 is connected in series with a switch 4 15, the switch 4 15 is connected in series with a switch 2 16, the switch 2 16 is connected to one end of the resistor 5 11, one end of the switch 12 is connected to a capacitor 2 17, the capacitor 2 17 is connected to one end of the switch 2 16, one end of the amplifier 4 is connected to a voltage reference 18, one end of the power adjustment tube 2 is connected to a voltage output 19, one end of the capacitor 14 is connected to the amplifier 4, and one end of the power adjustment tube 2 is connected to the capacitor 1 14, there is a node B at the connection between the resistor 1 5 and the resistor 2 7. When the switch 1 12 and the switch 2 16 are closed and the switch 3 13 and the switch 4 15 are opened, the capacitor 2 17 is connected in parallel to the resistor 4 10. At this time, the capacitor 2 17 will be charged. After being fully charged, the voltage across the capacitor 2 17 is equal to the voltage V1 across the resistor 4 10. When the switch 1 12 and the switch 2 16 are opened and the switch 3 13 and the switch 4 15 are closed, the capacitor 2 17 and the capacitor 1 14 will be connected in parallel. During the startup process, there is no voltage on the capacitor 14, and there is a voltage of V1 on the capacitor 2 17. The voltage of the capacitor 2 17 is higher than the voltage of the capacitor 1 14, and the capacitor 2 17 will charge the capacitor 1 14. The above process is continuously alternated, and finally the voltage on the capacitor 1 14 will be equal to the voltage across the resistor 4 10.
[0029] Working principle: The negative end of the amplifier 4 samples the voltage at the node B and compares it with the voltage reference 18. When the load suddenly increases, the voltage of the voltage reference 18 decreases, and the voltage at the node B also decreases accordingly. The voltage of the node B is lower than the voltage reference 18, and the output voltage of the amplifier 4 increases. The output voltage of the amplifier 4 is raised by a voltage V through the voltage boosting module 3. The input power supply 1 (how the voltage boosting module 3 boosts the voltage will be explained later) acts on the gate end of the power adjustment tube 2. The gate end voltage of the power adjustment tube 2 increases, the power adjustment tube 2 is more turned on, the potential of the voltage output 19 increases, and the potential of the node B also increases. When the voltage of the node B is equal to the voltage reference 18, the voltage output 19 stabilizes and no longer increases. When the load suddenly decreases, the voltage at the voltage output 19 increases, the voltage at the node B increases, and the voltage at the node B is higher than the voltage reference 18. The output voltage of the amplifier 4 decreases, the gate voltage of the power adjustment tube 2 decreases, the turning on degree of the power adjustment tube 2 decreases, the voltage of the voltage output 19 decreases, and the voltage of the node B decreases. When the node B is equal to the voltage reference 18, the voltage output 19 is stable. The working principle of the voltage boost module 3 is as follows: the switch 1 12 and the switch 2 16 are controlled by the signal of the same phase, the switch 3 13 and the switch 4 15 are controlled by the signal of the same phase, and the control signals of the switch 1 12 and the switch 3 13 are opposite, that is, when the switch 1 12 and the switch 2 16 are turned on, the switch 3 13 and the switch 4 15 are turned off, and when the switch 1 12 and the switch 2 16 are turned off, the switch 3 13 and the switch 4 15 are turned on. When the switch 1 12 and the switch 2 16 are closed, and the switch 3 13 and the switch 4 15 are turned on, the capacitor 2 17 is connected in parallel to the resistor 4 10. Capacitor 2 17 will be charged. When fully charged, the voltage across capacitor 2 17 is equal to the voltage V1 across resistor 4 10. When switch 1 12 and switch 2 16 are opened, and switch 3 13 and switch 4 15 are closed, capacitor 2 17 and capacitor 1 14 will be connected in parallel. During the startup process, there is no voltage on capacitor 1 14, and there is a voltage of V1 on capacitor 2 17. The voltage of capacitor 2 17 is higher than that of capacitor 1 14, so capacitor 2 17 will charge capacitor 1 14. The above two processes are continuously alternated, and finally the voltage on capacitor 1 14 will be equal to the voltage across resistor 4 10.
[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A novel step-down circuit, comprising an input power supply (1), a voltage reference (18), and a voltage output (19), characterized in that: The input power supply (1) is connected to a power adjustment tube (2), one end of the power adjustment tube (2) is connected to a voltage boosting module (3), the voltage boosting module (3) is connected to an amplifier (4), one end of the amplifier (4) is connected to a resistor 1 (5), the resistor 1 (5) is connected to a ground (6), one end of the power adjustment tube (2) is connected to a resistor 2 (7), and the resistor 2 (7) is connected to one end of the resistor 1 (5).
2. A novel step-down circuit according to claim 1, characterized in that: The voltage boosting module (3) comprises an internal power supply (8), the internal power supply (8) is connected to a resistor three (9), the resistor three (9) is connected to a resistor four (10), the resistor four (10) is connected to a resistor five (11), the resistor five (11) is connected to a ground (6), one end of the resistor three (9) is connected to a switch one (12), the switch one (12) is connected in series with a switch three (13), the switch three (13) is connected in series with a capacitor one (14), the capacitor one (14) is connected in series with a switch four (15), the switch four (15) is connected in series with a switch two (16), the switch two (16) is connected to one end of the resistor five (11), one end of the switch one (12) is connected to a capacitor two (17), the capacitor two (17) is connected to one end of the switch two (16).
3. A novel step-down circuit according to claim 1, characterized in that: One end of the amplifier (4) is connected to a voltage reference (18).
4. A novel step-down circuit according to claim 1, characterized in that: One end of the power adjustment tube (2) is connected to a voltage output (19).
5. A novel step-down circuit according to claim 2, characterized in that: One end of the capacitor (14) is connected to the amplifier (4).
6. A novel step-down circuit according to claim 1, characterized in that: One end of the power adjustment tube (2) is connected to capacitor 1 (14).
7. The novel step-down circuit according to claim 1 is characterized in that: There is a node B at the connection between the resistor 1 (5) and the resistor 2 (7).