Analog output circuit with sampling feedback

Abstract

The utility model provides an analog output circuit with sampling feedback, which comprises an output circuit, the output circuit outputs PWM signals, the output end of the output circuit is connected with a second resistor, the other end of the second resistor is connected with a signal amplifier, and the other end of the second resistor is connected with the positive signal input end of the signal amplifier. An integrating circuit assembly is connected between the second resistor and the signal amplifier in parallel, a fourth resistor is connected between the negative signal input end and the signal output end of the signal amplifier in parallel, the negative signal input end of the signal amplifier is connected with a third resistor, the signal output end of the signal amplifier is connected with a fifth resistor, and the other end of the fifth resistor is connected with an analog circuit. The analog circuit is used for outputting analog voltage signals, and a voltage dividing assembly is arranged between the fifth resistor and the analog circuit. According to the utility model, the PWM signal is converted into the DC analog electric signal through the integrating circuit assembly, so that the analog voltage signal can be stably output after the signal is amplified, and the stability of signal amplification and processing is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of output circuits, in particular to an analog output circuit with sampling feedback. Background Art

[0002] Analog output circuits usually refer to electronic circuits designed to generate continuous electrical signals, which can be voltage, current or other forms of analog signals. They are widely used in various fields, such as audio systems (power amplifiers), data processing equipment (such as ADC / DAC converters), measurement equipment, and industrial control systems. To amplify the input signal to meet the needs of a larger load, op amps (operational amplifiers) are often used to make linear amplifiers that can amplify or attenuate signals while keeping distortion small.

[0003] Some current output circuits directly output analog voltage signals after amplifying and converting the PWM signals using amplifiers. However, such analog output circuits may be unstable during amplification, resulting in large deviations in the analog voltage signals output after amplification, thus affecting the normal operation of the circuit.

[0004] In summary, there is a need for an analog output circuit that stably outputs an analog voltage signal. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides an analog output circuit with sampling feedback, which solves the problems mentioned in the background technology.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] An analog output circuit with sampling feedback includes an output circuit, the output circuit outputs a PWM signal, the output end of the output circuit is connected to a second resistor, the other end of the second resistor is connected to a signal amplifier, the other end of the second resistor is connected to a positive signal input end of the signal amplifier, an integration circuit component is connected in parallel between the second resistor and the signal amplifier, a fourth resistor is connected in parallel between the negative signal input end and the signal output end of the signal amplifier, the negative signal input end of the signal amplifier is connected to a third resistor, the signal output end of the signal amplifier is connected to a fifth resistor, the other end of the fifth resistor is connected to an analog circuit, the analog circuit is used to output an analog voltage signal, and a voltage divider component is connected between the fifth resistor and the analog circuit.

[0008] Furthermore, a calibration component is internally connected to the voltage divider component, and the calibration component is used to adjust the output analog voltage signal.

[0009] Furthermore, the voltage divider component includes a second capacitor, a sixth resistor and a seventh resistor, the positive terminal of the second capacitor is connected to the other end of the fifth resistor, the sixth resistor is connected to the other end of the fifth resistor, the other end of the sixth resistor is connected to the seventh resistor, the other end of the seventh resistor is connected to the negative terminal of the second capacitor, and a calibration component is connected between the sixth resistor and the seventh resistor.

[0010] Furthermore, the calibration component includes a single chip microcomputer, a sampling port of the single chip microcomputer is connected between the sixth resistor and the seventh resistor, and the single chip microcomputer outputs an analog voltage signal after adjusting the PWM duty cycle.

[0011] Furthermore, the integration circuit component includes a first capacitor and a first resistor, the positive terminal of the first capacitor is connected to the other end of the second resistor, the negative terminal of the first capacitor is connected to the first resistor, and the other end of the first resistor is connected to the positive signal input terminal of the signal amplifier.

[0012] The utility model provides an analog output circuit with sampling feedback. Compared with the prior art, it has the following beneficial effects:

[0013] 1. By converting the PWM signal into a DC analog electrical signal through an integration circuit component, the analog voltage signal can be output stably after the signal is amplified, thereby improving the stability of signal amplification and processing;

[0014] 2. After the DC analog electrical signal is divided by a voltage divider component, it is sampled and calibrated by a calibration component so that the output signal reaches a predetermined value, thereby improving the accuracy of the output signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The utility model shows a circuit diagram of analog output with sampling feedback; DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0018] Embodiment 1

[0019] In order to solve the technical problems in the background technology, the following analog output circuit with sampling feedback is provided:

[0020] Combination Figure 1 As shown, the analog output circuit with sampling feedback provided by the utility model includes an output circuit, the output circuit outputs a PWM signal, the output end of the output circuit is connected to a second resistor, the other end of the second resistor is connected to a signal amplifier, the other end of the second resistor is connected to the positive signal input end of the signal amplifier, an integration circuit component is connected in parallel between the second resistor and the signal amplifier, a fourth resistor is connected in parallel between the negative signal input end and the signal output end of the signal amplifier, the negative signal input end of the signal amplifier is connected to a third resistor, the signal output end of the signal amplifier is connected to a fifth resistor, the other end of the fifth resistor is connected to an analog circuit, the analog circuit is used to output an analog voltage signal, and a voltage divider component is connected between the fifth resistor and the analog circuit;

[0021] According to the above structure, the following effects can be achieved: by converting the PWM signal into a DC analog electrical signal after passing through the integration circuit component, the analog voltage signal can be output stably after the signal is amplified, thereby improving the stability of signal amplification and processing.

[0022] In this embodiment, the voltage divider component is internally connected with a calibration component, and the calibration component is used to adjust the output analog voltage signal;

[0023] The DC analog electrical signal is divided by a voltage divider component and then sampled and calibrated by a calibration component so that the output signal reaches a predetermined value, thereby improving the accuracy of the output signal.

[0024] In this embodiment, the voltage divider component includes a second capacitor, a sixth resistor and a seventh resistor. The positive terminal of the second capacitor is connected to the other end of the fifth resistor, the sixth resistor is connected to the other end of the fifth resistor, the other end of the sixth resistor is connected to the seventh resistor, the other end of the seventh resistor is connected to the negative terminal of the second capacitor, and a calibration component is connected between the sixth resistor and the seventh resistor.

[0025] Embodiment 2

[0026] like Figure 1 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0027] The calibration component includes a single chip microcomputer, a sampling port of the single chip microcomputer is connected between the sixth resistor and the seventh resistor, and the single chip microcomputer outputs an analog voltage signal after adjusting the PWM duty cycle.

[0028] In this embodiment, the integration circuit component includes a first capacitor and a first resistor, the positive terminal of the first capacitor is connected to the other end of the second resistor, the negative terminal of the first capacitor is connected to the first resistor, and the other end of the first resistor is connected to the positive signal input terminal of the signal amplifier.

[0029] The working principle and use process of this utility model:

[0030] Press first Figure 1 After the external circuit PWM-OUT outputs the PWM signal, it is converted into a DC analog voltage signal after passing through the integration circuit component composed of the first capacitor C1 and the first resistor R1, and then passes through the signal amplifier U1:B to output a stable analog voltage signal to the analog circuit A-OUT;

[0031] When the analog voltage signal is output to the analog circuit, the analog voltage signal is divided by the sixth resistor R6 and the seventh resistor R7, and the divided voltage is sampled through the high-precision AD sampling port of the microcontroller AD-IN, and then compared and calibrated with the required voltage signal output value, and adjusted through the PWM duty cycle until the output voltage signal is completely consistent with the expected value, thereby improving the output accuracy of the analog voltage signal.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Analog output circuit with sampling feedback, characterized by: The invention comprises an output circuit, which outputs a PWM signal. The output end of the output circuit is connected to a second resistor, the other end of the second resistor is connected to a signal amplifier, the other end of the second resistor is connected to a positive signal input end of the signal amplifier, an integrating circuit component is connected in parallel between the second resistor and the signal amplifier, a fourth resistor is connected in parallel between a negative signal input end and a signal output end of the signal amplifier, the negative signal input end of the signal amplifier is connected to a third resistor, the signal output end of the signal amplifier is connected to a fifth resistor, the other end of the fifth resistor is connected to an analog circuit, the analog circuit is used to output an analog voltage signal, and a voltage divider component is connected between the fifth resistor and the analog circuit.

2. The analog output circuit with sampling feedback according to claim 1, characterized in that: The voltage divider component is internally connected with a calibration component, and the calibration component is used to adjust the output analog voltage signal.

3. The analog output circuit with sampling feedback according to claim 2, characterized in that: The voltage divider component includes a second capacitor, a sixth resistor and a seventh resistor. The positive terminal of the second capacitor is connected to the other end of the fifth resistor, the sixth resistor is connected to the other end of the fifth resistor, the other end of the sixth resistor is connected to the seventh resistor, the other end of the seventh resistor is connected to the negative terminal of the second capacitor, and a calibration component is connected between the sixth resistor and the seventh resistor.

4. The analog output circuit with sampling feedback according to claim 3, characterized in that: The calibration component includes a single chip microcomputer, a sampling port of the single chip microcomputer is connected between the sixth resistor and the seventh resistor, and the single chip microcomputer outputs an analog voltage signal after adjusting the PWM duty cycle.

5. The analog output circuit with sampling feedback according to claim 1, characterized in that: The integration circuit component includes a first capacitor and a first resistor, wherein the positive terminal of the first capacitor is connected to the other end of the second resistor, the negative terminal of the first capacitor is connected to the first resistor, and the other end of the first resistor is connected to the positive signal input terminal of the signal amplifier.

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