Analog quantity isolation acquisition circuit

Abstract

The utility model discloses an analog quantity isolation acquisition circuit which is characterized in that the analog quantity isolation acquisition circuit comprises a signal isolation integration module, the input end of the signal isolation integration module is connected with a unidirectional positive voltage signal, and the output end of the signal isolation integration module is directly connected with an analog quantity acquisition input channel of an embedded processor. According to the utility model, the input analog quantity signal is a unidirectional positive voltage signal, and the input voltage access mode is changed, so that the output end voltage signal of the signal isolation integration module is also changed, and the requirement of the analog quantity acquisition input channel voltage value range of the embedded processor is just met; therefore, the output end of the signal isolation integration module can be directly connected with the input end of the analog quantity acquisition channel of the embedded processor, an additional signal processing circuit is not needed, the circuit is simplified, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to an analog signal isolation and acquisition circuit, which is suitable for a module of an existing analog signal isolation and acquisition circuit. Background Art

[0002] Analog signal isolation acquisition technology has a wide range of applications in power electronics, electrical testing and other fields. In the current analog signal isolation acquisition circuit design, the commonly used method is to use an isolation amplifier integrated module between the signal and the acquisition chip for signal isolation, and the linearity of the isolation module can reach 0.1%. The general circuit inputs an analog signal source into the input end of the signal isolation integrated module, and the other end outputs an isolated analog signal that is linearly consistent with the input signal change. This analog signal is then connected to the embedded processor for digital-to-analog conversion, thereby obtaining the digitized value of the collected analog signal.

[0003] Many signal isolation integrated modules have positive and negative bidirectional voltage inputs at the input end, and unidirectional positive signal outputs at the output end. For example, for a signal isolation integrated module with bidirectional voltage input and unidirectional signal output, when the actual input analog quantity is a unidirectional positive voltage signal greater than zero, the output of the signal isolation integrated module will have an inherent voltage value step. However, most of the current embedded processor analog quantity acquisition input channels can only accept a single-ended positive voltage value range. Therefore, in order to be compatible with the use of bidirectional voltage isolation integrated modules, additional signal processing circuits need to be added between the module output end and the embedded processor acquisition channel input end for matching. Utility Model Content

[0004] The purpose of the utility model is to provide a compatible and effective analog signal isolation and acquisition circuit.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is to provide an analog quantity isolation acquisition circuit, which is characterized in that it includes a signal isolation integrated module, the input end of the signal isolation integrated module is connected to a unidirectional positive voltage signal, and the output end of the signal isolation integrated module is directly connected to the analog quantity acquisition input channel of the embedded processor.

[0006] Preferably, the positive voltage terminal of the input end of the signal isolation integrated module is connected to the negative voltage terminal of the unidirectional positive voltage signal, and the negative voltage terminal of the input end of the signal isolation integrated module is connected to the positive voltage terminal of the unidirectional positive voltage signal.

[0007] The input analog signal of the utility model is a unidirectional positive voltage signal. By changing the input voltage access mode, the output voltage signal of the signal isolation integrated module is also changed, so that it just meets the requirements of the voltage value range of the analog quantity acquisition input channel of the embedded processor. Therefore, the output end of the signal isolation integrated module can be directly connected to the input end of the analog quantity acquisition channel of the embedded processor, without adding an additional signal processing circuit, thus simplifying the circuit and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 The utility model discloses a principle block diagram of an analog quantity isolation acquisition circuit. DETAILED DESCRIPTION

[0009] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0010] like Figure 1 As shown, the analog signal isolation acquisition circuit disclosed in this embodiment is composed of the following parts: a signal isolation integrated module, an embedded processor with an analog-to-digital conversion channel, and a peripheral device circuit.

[0011] The actual input analog signal of the utility model is a unidirectional positive voltage signal. The voltage reversal method is adopted at the input end of the signal isolation integrated module to change the analog input positive voltage signal into a negative voltage signal and connect it to the signal isolation integrated module. In this way, the output voltage signal of the signal isolation integrated module becomes a positive voltage output, which just meets the range of voltage values ​​that the analog acquisition input channel of the embedded processor can accept. Therefore, the utility model can directly connect the output end of the signal isolation integrated module to the input end of the analog acquisition channel of the embedded processor without adding additional signal processing circuits. It should be noted that after adopting the voltage reversal method, the input signal and the output signal become inversely proportional. It is only necessary to perform a simple conversion process on the measured value in the embedded processor program to obtain the corresponding accurate input signal value.

Claims

1. An analog quantity isolation acquisition circuit, characterized in that: It comprises a signal isolation integrated module, the input end of which is connected to a unidirectional positive voltage signal, and the output end of which is directly connected to an analog quantity acquisition input channel of an embedded processor.

2. The analog quantity isolation acquisition circuit according to claim 1, characterized in that: The positive voltage terminal of the input end of the signal isolation integrated module is connected to the negative voltage terminal of the unidirectional positive voltage signal, and the negative voltage terminal of the input end of the signal isolation integrated module is connected to the positive voltage terminal of the unidirectional positive voltage signal.

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