A composite type pressure expanding, flow expanding and frequency expanding circuit

Abstract

The present application relates to the technical field of electronic measurement, more particularly, it is especially related to a composite pressure expansion, flow expansion and frequency expansion circuit, which comprises an input signal source, a front-stage precision operational amplifier circuit, a rear-stage high-voltage and high-current operational amplifier circuit and a feedback loop, the input signal source is connected with the input end of the front-stage precision operational amplifier circuit, the output end of the front-stage precision operational amplifier circuit is connected with the input end of the rear-stage high-voltage and high-current operational amplifier circuit, and the feedback loop is connected between the output end of the rear-stage high-voltage and high-current operational amplifier circuit and the input end of the front-stage precision operational amplifier circuit.The present application uses cascaded operational amplifier circuits to realize a high-precision, high-voltage, high-current and wide-frequency output circuit.Through multi-stage operational amplifier cascading and feedback configuration, higher closed-loop gain is obtained under the premise of ensuring stability, and the effective bandwidth is expanded to meet the high-frequency or high-gain signal processing requirements.

Description

Technical Field

[0001] This invention relates to the field of electronic measurement technology, and more specifically, to a composite voltage-diffraction, current-diffraction, and frequency-diffraction circuit. Background Technology

[0002] Cascaded operational amplifier circuits with voltage, current, and frequency amplification are closely related to the diverse power supply and signal processing requirements of electronic devices, as detailed below: In many electronic systems, different voltage levels are required to drive various components. However, common operational amplifiers and other components are mostly suitable for low-voltage circuits. High-voltage operational amplifiers are not only fewer in number, but also require additional components to adapt to high-voltage circuits, leading to increased cost and size. Therefore, a voltage diffuser circuit is needed that can use small-size, low-cost low-voltage operational amplifiers in high-voltage circuits to meet the stringent product design requirements in terms of size, performance, power consumption, and cost. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the objective of this invention is to propose a composite voltage-diffraction, current-diffraction, and frequency-spreading circuit that uses cascaded operational amplifier circuits to achieve a high-precision, high-voltage, high-current, and wide-frequency output circuit.

[0004] To achieve the above and other related objectives, the present invention provides a composite voltage-diffraction, current-diffraction, and frequency-diffraction circuit, comprising: an input signal source, a pre-stage precision operational amplifier circuit, a post-stage high-voltage, high-current operational amplifier circuit, and a feedback loop. The input signal source is connected to the input terminal of the pre-stage precision operational amplifier circuit, the output terminal of the pre-stage precision operational amplifier circuit is connected to the input terminal of the post-stage high-voltage, high-current operational amplifier circuit, and the feedback loop is connected between the output terminal of the post-stage high-voltage, high-current operational amplifier circuit and the input terminal of the pre-stage precision operational amplifier circuit.

[0005] In one embodiment of the present invention, the input signal source is an AC 10V 100kHz AC signal source.

[0006] In one embodiment of the present invention, the pre-amplifier precision operational amplifier circuit includes: a precision operational amplifier U1, a resistor R2, a resistor R3, and a capacitor C2. The non-inverting input terminal of the precision operational amplifier U1 is connected to the feedback loop, the inverting input terminal of the precision operational amplifier U1 is connected to one end of the resistor R2 and one end of the capacitor C2, the other end of the resistor R2 is grounded, the other end of the capacitor C2 is connected to one end of the resistor R3 and the subsequent high-voltage, high-current operational amplifier circuit, and the other end of the resistor R3 is connected to the output terminal of the precision operational amplifier U1.

[0007] In one embodiment of the present invention, the subsequent high-voltage, high-current operational amplifier circuit includes a high-voltage, high-current operational amplifier U2, resistors R5, R6, R7, and R8, capacitors C3 and C4. One end of resistor R5 is connected to the other end of capacitor C2. The other end of resistor R5 is connected to the inverting input terminal of the high-voltage, high-current operational amplifier U2, one end of resistor R7, and one end of capacitor C4. The other ends of resistor R7 and capacitor C4 are connected to one end of resistor R8 and the output terminal of the high-voltage, high-current operational amplifier U2. The other end of resistor R8 is connected to the negative power supply terminal, the output terminal, and the feedback loop of the high-voltage, high-current operational amplifier U2. The non-inverting input terminal of the high-voltage, high-current operational amplifier U2 is connected to one end of capacitor C3 and one end of resistor R6. The other ends of capacitor C3 and resistor R6 are grounded.

[0008] In one embodiment of the present invention, the feedback loop includes resistors R1 and R4, capacitors C1 and C6. One end of resistor R4 and one end of capacitor C6 are both connected to the output terminal of high-voltage, high-current operational amplifier U2. The other end of resistor R4, the other end of capacitor C6, the non-inverting input terminal of precision operational amplifier U1, one end of resistor R1, and one end of capacitor C1 are connected to the input signal source.

[0009] In one embodiment of the present invention, the precision operational amplifier U1 is model OPA128.

[0010] In one embodiment of the present invention, the high-voltage, high-current operational amplifier U2 is model PA85.

[0011] In one embodiment of the present invention, the precision operational amplifier U1, resistor R2 and capacitor C2 form a positive integrating circuit.

[0012] In one embodiment of the present invention, the high-voltage high-current operational amplifier U2, resistors R5, R6, R7, and R8, capacitors C3 and C4 form an inverting proportional amplifier circuit and a lead compensation circuit.

[0013] In one embodiment of the present invention, the pre-stage precision operational amplifier circuit, the post-stage high-voltage high-current operational amplifier circuit, resistors R1 and R4, capacitors C1 and C6 form a negative feedback amplifier circuit.

[0014] As described above, the composite voltage-diffraction, current-diffraction, and frequency-spreading circuit of the present invention has the following beneficial effects: This invention discloses a composite voltage-diffraction, current-diffraction, and frequency-spreading circuit that uses cascaded operational amplifiers to achieve a high-precision, high-voltage, high-current, and wide-frequency output circuit. Through multi-stage operational amplifier cascading and feedback configuration, higher closed-loop gain is achieved while ensuring stability, and the effective bandwidth is expanded to meet the needs of high-frequency or high-gain signal processing.

[0015] The present invention provides a composite voltage-diffraction, current-diffraction, and frequency-spreading circuit that, through feedback coordination between the pre-amplifier and the post-amplifier, suppresses nonlinear distortion and improves the fidelity of the output signal.

[0016] The present invention discloses a composite voltage-diffraction, current-diffraction, and frequency-diffraction circuit, in which a power amplifier stage is introduced into the composite loop to enhance the load-carrying capacity, drive high-current loads or output high-voltage signals, while maintaining precise control of the main loop.

[0017] The present invention provides a composite voltage-diffraction, current-diffraction, and frequency-spreading circuit, which rationally designs the loop feedback network, optimizes the phase margin and gain margin of the system, and avoids self-excited oscillation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to an embodiment of the present invention; Detailed Implementation The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] Terms such as "first" or "second" may be used to describe various components, but these components are not limited by the terms described above. The terms described above are used to distinguish one component from another; for example, without departing from the scope of the concept according to this disclosure, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

[0021] Furthermore, "connected / linked" indicates that one component is directly electrically connected to another component or indirectly electrically connected through another component. Unless otherwise explicitly stated in the sentence, the singular form may include the plural form. Additionally, the terms "comprising / including" or "containing / including" as used in this specification indicate the presence or addition of one or more components, steps, operations, and elements. Specific structural or functional descriptions of examples of embodiments of the concepts disclosed in this specification are merely illustrative to describe examples of embodiments of the concepts, and examples of embodiments of the concepts can be implemented in various forms, but these descriptions are not limited to the examples of embodiments described in this specification.

[0022] Based on the concept, various modifications and changes can be applied to examples of embodiments, such that examples of embodiments will be illustrated in the accompanying drawings and described in the specification. However, examples of embodiments based on the concept are not limited to specific embodiments, but include all changes, equivalents, or substitutions included within the spirit and scope of this disclosure.

[0023] It should be understood that when describing an element as "connected" or "linked" to another element, the element may be directly connected or linked to the other element, or it may be connected or linked to the other element via a third element. Conversely, it should be understood that when an element is described as "directly connected to" or "directly linked to" another element, no other element is placed between them. Other expressions describing relationships between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same way.

[0024] The terminology used in this specification is for the purpose of describing specific examples of implementations only and is not intended to limit this disclosure. The singular form may include the plural form unless there is an explicit contrary meaning in the context. It should be understood in this specification that the terms "comprising" or "having" indicate the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0025] Unless otherwise defined, all terms used herein (including technical or scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art. If a term is not clearly defined in a common dictionary in this specification, it shall be interpreted as having the same meaning as in the context of the relevant art, and not as an ideal or overly formal meaning.

[0026] Descriptions of known components and processing techniques may be omitted to avoid unnecessarily obscuring the embodiments of this disclosure.

[0027] Throughout this specification, the same reference numerals refer to the same elements. Therefore, even if a reference numeral is not mentioned or described with reference to one drawing, it may be mentioned or described with reference to another drawing. Furthermore, even if a reference numeral is not shown in one drawing, it may be mentioned or described with reference to another drawing.

[0028] Additionally, the logic level of a signal may be different from or opposite to the logic level described. For example, a signal described as having a logic "high" level may optionally have a logic "low" level, and a signal described as having a logic "low" level may optionally have a logic "high" level.

[0029] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0030] Some loads require a large current to operate normally, but commonly used power supply chips such as three-terminal regulators, like the LM7805 and LM317, have limited nominal output voltages. For example, the LM7805 has a maximum output current of 1.5A but a voltage of only 5V and low accuracy, which cannot meet the needs of high-voltage, high-current loads. To enable the power supply to provide current under high voltage conditions, a current-amplifying circuit is needed. This is achieved by using external power transistors or other methods to increase the output current, thereby driving high-current loads such as high-power motors and high-brightness LEDs.

[0031] Spread spectrum technology was initially developed by the US military during World War II to provide a more stable and secure communication method. Its core principle is to use pseudo-random codes to modulate signals, expanding the signal bandwidth and giving the signal strong anti-interference capabilities and high confidentiality. With the development of communication technology, spread spectrum technology has been widely applied in wireless communication, satellite communication, and other fields, such as Wi-Fi, Bluetooth, and GPS, to ensure the stability and security of communication in complex electromagnetic environments.

[0032] In order to meet the needs of electronic devices in terms of voltage drive, high current load support and anti-interference communication, this invention designs a composite circuit that can simultaneously realize voltage amplification, current amplification and frequency amplification functions.

[0033] Please see Figure 1 , Figure 1This is a schematic diagram of a composite voltage-spreading, current-spreading, and frequency-spreading circuit according to an embodiment of the present invention. The present invention provides a composite voltage-spreading, current-spreading, and frequency-spreading circuit, comprising: an input signal source, a pre-stage precision operational amplifier circuit, a post-stage high-voltage, high-current operational amplifier circuit, and a feedback loop. The input signal source is connected to the input terminal of the pre-stage precision operational amplifier circuit, the output terminal of the pre-stage precision operational amplifier circuit is connected to the input terminal of the post-stage high-voltage, high-current operational amplifier circuit, and the feedback loop is connected between the output terminal of the post-stage high-voltage, high-current operational amplifier circuit and the input terminal of the pre-stage precision operational amplifier circuit.

[0034] Specifically, the input signal source is an AC 10V 100kHz AC signal source.

[0035] Specifically, the pre-amplifier precision operational amplifier circuit includes: a precision operational amplifier U1, resistors R2 and R3, and capacitor C2. The non-inverting input of the precision operational amplifier U1 is connected to the feedback loop, and the inverting input of the precision operational amplifier U1 is connected to one end of resistor R2 and one end of capacitor C2. The other end of resistor R2 is grounded, and the other end of capacitor C2 is connected to one end of resistor R3 and the subsequent high-voltage, high-current operational amplifier circuit. The other end of resistor R3 is connected to the output of the precision operational amplifier U1.

[0036] Specifically, the subsequent high-voltage, high-current operational amplifier circuit includes a high-voltage, high-current operational amplifier U2, resistors R5, R6, R7, and R8, capacitors C3 and C4. One end of resistor R5 is connected to the other end of capacitor C2. The other end of resistor R5 is connected to the inverting input terminal of the high-voltage, high-current operational amplifier U2, one end of resistor R7, and one end of capacitor C4. The other ends of resistor R7 and capacitor C4 are connected to one end of resistor R8 and the output terminal of the high-voltage, high-current operational amplifier U2. The other end of resistor R8 is connected to the negative power supply terminal, the output terminal, and the feedback loop of the high-voltage, high-current operational amplifier U2. The non-inverting input terminal of the high-voltage, high-current operational amplifier U2 is connected to one end of capacitor C3 and one end of resistor R6. The other ends of capacitor C3 and resistor R6 are grounded.

[0037] Specifically, the feedback loop includes resistors R1 and R4, capacitors C1 and C6. One end of resistor R4 and one end of capacitor C6 are connected to the output terminal of high-voltage, high-current operational amplifier U2. The other end of resistor R4, the other end of capacitor C6, the non-inverting input terminal of precision operational amplifier U1, one end of resistor R1, and one end of capacitor C1 are connected to the input signal source. Specifically, the precision operational amplifier U1 is model OPA128. The high-voltage, high-current operational amplifier U2 is model PA85. The precision operational amplifier U1, resistor R2, and capacitor C2 form a positive integrating circuit. The high-voltage, high-current operational amplifier U2, resistors R5, R6, R7, and R8, capacitors C3 and C4 form an inverting proportional amplifier circuit and a lead compensation circuit. The pre-stage precision operational amplifier circuit, the post-stage high-voltage, high-current operational amplifier circuit, resistors R1 and R4, capacitors C1 and C6 form a negative feedback amplifier circuit.

[0038] In one embodiment of the present invention, the specific function of a composite voltage-diffraction-current-diffraction-spectrum-spreading circuit is described as follows: (1) Input signal source V1: AC 10V 100kHz AC signal source.

[0039] (2) The pre-amplifier precision operational amplifier circuit ensures the accuracy of the final output voltage. The following is a detailed analysis: 1) Circuit structure: The positive integrating circuit is composed of a precision operational amplifier U1, a resistor R2 and a capacitor C2.

[0040] 2) Circuit Function: During initial operation, the integrating capacitor C2 begins to charge, causing the precision operational amplifier U1 to be in a deep negative feedback state. Due to the "virtual short" effect of the op-amp, the voltage at the positive input terminal of U1 is equal to the voltage at the negative input terminal. Integral time: When integration is complete, the integrating capacitor C2 is essentially open-circuited, making... 0, which ensures stable output of the entire loop feedback.

[0041] 3) The accuracy of the output voltage of the entire circuit depends on the input offset voltage of the precision operational amplifier U1, so a precision operational amplifier with a low input offset voltage should be selected.

[0042] The function of resistor R3 is to protect U1 and prevent its output current from being too high.

[0043] (3) The subsequent high-voltage, high-current operational amplifier circuit provides high voltage and high current. The following is a detailed analysis: 1) Circuit structure: The circuit consists of a high-voltage, high-current operational amplifier U2, resistors R5, R6, R7 and R8, and capacitors C3 and C4, forming an inverting proportional amplifier circuit and a lead compensation circuit.

[0044] 2) Circuit function: The closed-loop gain of the amplifier circuit is: This circuit achieves voltage amplification of the internal feedback loop, with the voltage output limit determined by the maximum output voltage of operational amplifier U2. Since the output current limit of the entire circuit is also determined by the maximum output current of operational amplifier U2, selecting a high-voltage power operational amplifier such as PA85 is crucial for realizing both voltage and current amplification functions.

[0045] The circuit input signal source V1 is an AC 10V 100kHz signal source. To improve the phase margin of operational amplifier U2 and prevent high-frequency signal oscillation distortion, capacitor C4 implements a lead compensation function. The loop gain of the lead-compensated operational amplifier circuit is: ,in The open-loop gain of operational amplifier U2 Feedback coefficient; , Substituting into the formula, we get .

[0046] The compensation capacitor C4 provides a zero and a pole for the loop because Therefore, the zero point appears on the low-frequency side of the pole. When the zero point is positioned appropriately, it will cancel out the open-loop gain of U2. The corresponding poles and their associated phase shifts are used to suppress the self-excited oscillation of the feedback loop (compensating for phase lag and ensuring loop stability) and achieve the spread spectrum function.

[0047] The feedback loop connects the preceding precision operational amplifier circuit and the subsequent high-voltage, high-current operational amplifier circuit, forming a composite operational amplifier feedback loop. The following is a detailed analysis: 1) Circuit structure: The circuit consists of a pre-stage precision operational amplifier circuit, a post-stage high-voltage high-current operational amplifier circuit, resistors R1 and R4, and capacitors C1 and C6 forming a negative feedback amplifier circuit.

[0048] 2) Circuit function: Closed-loop gain of the composite operational amplifier circuit: , Improved gain and bandwidth performance: By cascading multiple operational amplifiers and configuring feedback, higher closed-loop gain is achieved while ensuring stability, and the effective bandwidth is expanded to meet the needs of high-frequency or high-gain signal processing.

[0049] Reduce errors and distortion: By using feedback between the pre-amplifier and the post-amplifier, nonlinear distortion is suppressed, and the fidelity of the output signal is improved.

[0050] Extended output capability: The composite loop introduces a power amplifier stage to enhance the load-carrying capacity, drive high-current loads or output high-voltage signals, while maintaining precise control of the main loop.

[0051] Enhance stability and anti-interference capability: Design the loop feedback network rationally, optimize the phase margin and gain margin of the system, and avoid self-excited oscillation.

[0052] In summary, the composite voltage-diffraction, current-diffraction, and frequency-spreading circuit of this invention suppresses nonlinear distortion and improves the fidelity of the output signal through feedback coordination between the pre-stage and post-stage operational amplifiers. The composite loop of this invention introduces a power amplifier stage to enhance load-carrying capacity, enabling the driving of high-current loads or the output of high-voltage signals, while maintaining precise control of the main loop. A rationally designed loop feedback network optimizes the system's phase and gain margins, preventing self-oscillation.

[0053] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A composite voltage-diffraction, current-diffraction, and frequency-spreading circuit, characterized in that, include: The system comprises an input signal source, a pre-amplifier precision operational amplifier circuit, a post-amplifier high-voltage high-current operational amplifier circuit, and a feedback loop. The input signal source is connected to the input terminal of the pre-amplifier precision operational amplifier circuit, the output terminal of the pre-amplifier precision operational amplifier circuit is connected to the input terminal of the post-amplifier high-voltage high-current operational amplifier circuit, and the feedback loop is connected between the output terminal of the post-amplifier high-voltage high-current operational amplifier circuit and the input terminal of the pre-amplifier precision operational amplifier circuit.

2. The composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to claim 1, characterized in that: The input signal source is an AC 10V 100kHz AC signal source.

3. The composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to claim 1, characterized in that: The pre-amplifier precision operational amplifier circuit includes: a precision operational amplifier U1, resistors R2 and R3, and capacitor C2. The non-inverting input of the precision operational amplifier U1 is connected to the feedback loop. The inverting input of the precision operational amplifier U1 is connected to one end of resistor R2 and one end of capacitor C2. The other end of resistor R2 is grounded. The other end of capacitor C2 is connected to one end of resistor R3 and the subsequent high-voltage, high-current operational amplifier circuit. The other end of resistor R3 is connected to the output of the precision operational amplifier U1.

4. The composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to claim 3, characterized in that: The subsequent high-voltage, high-current operational amplifier circuit includes a high-voltage, high-current operational amplifier U2, resistors R5, R6, R7, and R8, capacitors C3 and C4. One end of resistor R5 is connected to the other end of capacitor C2. The other end of resistor R5 is connected to the inverting input terminal of the high-voltage, high-current operational amplifier U2, one end of resistor R7, and one end of capacitor C4. The other ends of resistor R7 and capacitor C4 are connected to one end of resistor R8 and the output terminal of the high-voltage, high-current operational amplifier U2. The other end of resistor R8 is connected to the negative power supply terminal, the output terminal, and the feedback loop of the high-voltage, high-current operational amplifier U2. The non-inverting input terminal of the high-voltage, high-current operational amplifier U2 is connected to one end of capacitor C3 and one end of resistor R6. The other ends of capacitor C3 and resistor R6 are grounded.

5. A composite voltage-diffusing, current-diffusing, and frequency-spreading circuit according to claim 4, characterized in that: The feedback loop includes resistors R1 and R4, capacitors C1 and C6. One end of resistor R4 and one end of capacitor C6 are connected to the output terminal of high-voltage, high-current operational amplifier U2. The other end of resistor R4, the other end of capacitor C6, the non-inverting input terminal of precision operational amplifier U1, one end of resistor R1, and one end of capacitor C1 are connected to the input signal source.

6. A composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to claim 3, characterized in that: The precision operational amplifier U1 is model OPA128.

7. A composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to claim 3, characterized in that: The high-voltage, high-current operational amplifier U2 is model PA85.

8. A composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to claim 3, characterized in that: The precision operational amplifier U1, resistor R2, and capacitor C2 form a positive integrating circuit.

9. A composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to claim 4, characterized in that: The high-voltage, high-current operational amplifier U2, resistors R5, R6, R7, and R8, and capacitors C3 and C4 form an inverting proportional amplifier circuit and a lead compensation circuit.

10. A composite voltage-diffraction, current-diffraction, and frequency-spreading circuit according to claim 5, characterized in that: The preceding precision operational amplifier circuit, the following high-voltage high-current operational amplifier circuits, resistors R1 and R4, capacitors C1 and C6 form a negative feedback amplifier circuit.

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