Improved precision-controllable analog-to-digital conversion circuit structure

Abstract

The invention discloses an improved precision-controllable analog-to-digital conversion circuit structure, which is characterized in that two phases of PWM (Pulse-Width Modulation) signals are respectively input into corresponding phase inverters, the right end of one phase inverter U1C is connected with a resistor R1, then is connected with the right end of the other phase inverter U1C in parallel, is grounded through capacitors C1 and C2, and is connected with the left end of a resistor R2; the right end of the resistor R2 is connected with the left end of the resistor R3 and the left end of the capacitor C3. The right end of the resistor R3 is connected with the input positive end of the operational amplifier U2B and grounded through the C4, the right end of the resistor C3 is connected with the input negative end and the output end of the operational amplifier U2B, and the output end of the operational amplifier U2B serves as the output end of direct-current voltage. Actual output of low ripples is achieved by adjusting the duty ratio of two-phase PWM, meanwhile, output ripples can be changed by changing the frequency of the PWM, low-ripple output can be achieved, the response speed is high, the circuit is simple, low in cost and high in reliability, anti-interference capacity and load driving capacity, and the overall performance of the power supply is remarkably improved.

Description

Technical Field

[0001] The invention relates to an analog-to-digital conversion circuit, and in particular to an improved analog-to-digital conversion circuit structure with controllable precision. Background Art

[0002] At present, the analog-to-digital conversion circuit in the prior art realizes analog-to-digital conversion through one-phase PWM signal control.

[0003] A single-phase PWM signal is input to the inverter. The right end of the inverter U1C is connected to resistor R1, which is connected to the ground through capacitors C1 and C2. The right end of R1 resistor is connected to the left end of R2 resistor, and the right end of R2 resistor is connected to the left end of R3 resistor and the left end of C3 capacitor. The right end of R3 resistor is connected to the 5th pin of the operational amplifier and grounded through C1. The right end of C3 is connected to the 6th and 7th pins of the operational amplifier, and the 7th pin of the operational amplifier is used as the output end of the DC voltage.

[0004] Disadvantages of existing technology:

[0005] The output ripple requirement is not high.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide an improved analog-to-digital conversion circuit structure with controllable accuracy to solve the above-mentioned technical problems existing in the prior art.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] The improved analog-to-digital conversion circuit structure with controllable precision of the present invention realizes low output ripple of the analog-to-digital conversion circuit by superimposing two-phase PWM signals, thereby reducing the overall output ripple of the linear power supply.

[0010] Compared with the prior art, the present invention provides BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure of an improved analog-to-digital conversion circuit with controllable precision provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0012] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0013] First, the terms that may be used in this article are explained as follows:

[0014] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0015] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0016] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0017] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0018] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0019] The contents not described in detail in the examples of the present invention belong to the prior art known to professionals in the field. If no specific conditions are specified in the examples of the present invention, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used in the examples of the present invention, they are all conventional products that can be purchased commercially.

[0020] The improved analog-to-digital conversion circuit structure with controllable precision of the present invention realizes low output ripple of the analog-to-digital conversion circuit by superimposing two-phase PWM signals, thereby reducing the overall output ripple of the linear power supply.

[0021] The two-phase PWM signals are input to the corresponding inverters respectively. The right end of one inverter U1 C is connected to the resistor R1 and then connected in parallel with the right end of the other inverter U1 C. Then, it is connected to the ground through the capacitors C1 and C2 and connected to the left end of the R2 resistor. The right end of the R2 resistor is connected to the left end of the R3 resistor and the left end of the C3 capacitor respectively.

[0022] The right end of resistor R3 is respectively connected to the positive input terminal of operational amplifier U2B and grounded through C4. The right end of C3 is connected to the negative input terminal and output terminal of operational amplifier U2B. The output terminal of operational amplifier U2B serves as the output terminal of DC voltage.

[0023] The actual output with low ripple can be achieved by adjusting the duty cycle of the two-phase PWM, and the output ripple can be changed by changing the frequency of PWM.

[0024] From the above, it can be seen that the improved controllable precision analog-to-digital conversion circuit structure of the embodiment of the present invention is an improved design based on the controllable precision analog-to-digital conversion circuit, which can achieve lower output ripple.

[0025] The improved controllable precision analog-to-digital conversion circuit described in the present invention adds a PWM input signal to the input end of the original controllable precision analog-to-digital conversion circuit, which has a phase difference of 180 degrees from the original PWM signal and increases the PWM frequency.

[0026] Compared with a PWM signal input in the original analog-to-digital conversion circuit, this overall method reduces the output ripple to a greater extent while keeping all aspects unchanged.

[0027] The improved controllable precision analog-to-digital conversion circuit is suitable for the realization of various low-ripple power supply circuits. Its main advantages are that it can realize low-ripple output, high response speed, simple circuit and low cost, strong reliability, anti-interference ability and driving load capacity. The use of the improved controllable precision analog-to-digital conversion circuit significantly improves the overall performance of the power supply, so the improved controllable precision analog-to-digital conversion circuit has a broader use value and application prospects.

[0028] Key technologies:

[0029] By adding a phase PWM signal control and adjusting the duty cycle by adjusting the PWM signal, the output voltage can be precisely controlled. The higher the PWM signal frequency of the present invention, the lower the output ripple.

[0030] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail with specific embodiments below.

[0031] Example 1

[0032] The improved controllable precision analog-to-digital conversion circuit of the present invention realizes the advantage of low output ripple of the analog-to-digital conversion circuit by superimposing two-phase PWM signals, thereby reducing the overall output ripple of the linear power supply.

[0033] The present invention mainly introduces a structural implementation method of an improved controllable precision analog-to-digital conversion circuit. The main circuit structure implementation method is as follows: Figure 1 As shown:

[0034] The two-phase PWM signals are input to the corresponding inverters respectively. The right end of the inverter U1 C is connected to the resistor R1, which is connected to the ground through the capacitors C1 and C2. The right end of the R1 resistor is connected to the left end of the R2 resistor, and the right end of the R2 resistor is connected to the left end of the R3 resistor and the left end of the C3 capacitor. The right end of the R3 resistor is connected to the 5-pin terminal of the operational amplifier U2B and grounded through C4. The right end of C3 is connected to the 6-pin terminal and the 7-pin terminal of the operational amplifier. The 7-pin terminal of the operational amplifier is used as the output terminal of the DC voltage.

[0035] Beneficial effects brought by the technical solution of the present invention:

[0036] The actual output with low ripple can be achieved by adjusting the duty cycle of the two-phase PWM. At the same time, the output ripple can be changed by changing the frequency of PWM. Once the ripple requirement is higher, the advantages of this solution are more obvious, and the analog-to-digital conversion circuit with controllable accuracy can be better realized.

[0037] In the present invention, U1C can be replaced by an inverter with similar functions, and U2B can be replaced by an operational amplifier with similar functions, both of which can realize an improved analog-to-digital conversion circuit with controllable accuracy. At the same time, the inverter can also be replaced according to needs to ensure that the analog-to-digital conversion circuit can be realized.

[0038] The key technical points and the points to be protected of the present invention are:

[0039] An improved analog-to-digital conversion circuit with controllable precision realizes the actual output of low ripple in the analog-to-digital conversion circuit by adjusting the two-phase PWM signal.

[0040] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. An improved analog-to-digital conversion circuit structure with controllable accuracy, characterized in that: The output ripple of the analog-to-digital conversion circuit is low by superimposing two-phase PWM signals, thereby reducing the overall output ripple of the linear power supply.

2. The improved controllable precision analog-to-digital conversion circuit structure according to claim 1 is characterized in that: The two-phase PWM signals are input to the corresponding inverters (U1 C) respectively. The right end of one inverter (U1C) is connected to resistor 1 (R1) and then connected in parallel with the right end of the other inverter (U1 C). Then, it is connected to the ground through capacitor 1 (C1) and capacitor 2 (C2) and connected to the left end of resistor 2 (R2). The right end of resistor 2 (R2) is connected to the left end of resistor 3 (R3) and the left end of capacitor 3 (C3) respectively. The right end of resistor three (R3) is respectively connected to the positive input terminal of the operational amplifier (U2B) and grounded through capacitor four (C4), the right end of capacitor three (C3) is connected to the negative input terminal and output terminal of the operational amplifier (U2B), and the output terminal of the operational amplifier (U2B) serves as the output terminal of the DC voltage.

3. The improved controllable precision analog-to-digital conversion circuit structure according to claim 2 is characterized in that: The actual output with low ripple can be achieved by adjusting the duty cycle of the two-phase PWM, and the output ripple can be changed by changing the frequency of PWM.

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