Isolated multi-channel frequency converter control output circuit

Abstract

The utility model discloses an isolation type multipath frequency converter control output circuit, which comprises a frequency converter port, a controller module, a digital isolation module, a digital-to-analog conversion module and a signal amplification module, the digital-to-analog conversion module is provided with a plurality of output ends, the controller module is connected with the digital isolation module, and the digital isolation module is connected with the signal amplification module. The digital isolation module is connected with the digital-to-analog conversion module, the output ends of the digital-to-analog conversion module are connected with the signal amplification modules in a one-to-one correspondence manner, and the signal amplification modules are connected with the frequency converter ports in a one-to-one correspondence manner. According to the technical scheme, the digital isolation module is arranged between the controller module and the digital-to-analog conversion module, and the controller module is indirectly connected with the digital-to-analog conversion module through the digital isolation module, so that the interference and safety of the circuit are improved, and the influence of voltage fluctuation of an external circuit is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and more specifically to an isolated multi-channel frequency converter control output circuit. Background Technology

[0002] Variable frequency drives (VFDs) are common electronic devices in the field of motor control. They are used to control the operating parameters of a motor based on external input signals.

[0003] Among the many input terminals of a frequency converter, one is specifically used to control the converter's power output. This input terminal controls the converter's power output based on the amplitude of the input analog signal. Therefore, when an intelligent controller is connected to the frequency converter, a digital-to-analog converter (DAC) is needed to convert the digital signal output by the intelligent controller into an analog signal before transmitting the digital signal to the frequency converter. In existing technology, the intelligent controller and the DAC are directly connected, which results in poor anti-interference and security, and is easily affected by voltage fluctuations in external circuits. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an isolated multi-channel frequency converter control output circuit.

[0005] The technical solution adopted by this utility model to solve the problem is:

[0006] An isolated multi-channel frequency converter control output circuit includes a frequency converter port, a controller module, a digital isolation module, a digital-to-analog converter module, and a signal amplification module. The digital-to-analog converter module is configured with multiple output terminals. The number of signal amplification modules, the number of frequency converter ports, and the number of output terminals of the digital-to-analog converter module are the same. The controller module is connected to the digital isolation module, the digital isolation module is connected to the digital-to-analog converter module, the output terminals of the digital-to-analog converter module are connected to the signal amplification modules one-to-one, and the signal amplification modules are connected to the frequency converter ports one-to-one.

[0007] As a further improvement to the above technical solution, the digital isolation module includes a digital isolation chip of model NSI8241. The digital isolation chip is configured with a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal. The controller module is configured with a data terminal, a clock terminal, and a chip select terminal. The data terminal of the controller module is connected to the first input terminal of the digital isolation chip, the clock terminal of the controller module is connected to the second input terminal of the digital isolation chip, the chip select terminal of the controller module is connected to the third input terminal of the digital isolation chip, and the first, second, and third output terminals of the digital isolation chip are connected to the digital-to-analog converter module.

[0008] As a further improvement to the above technical solution, the digital-to-analog converter module includes a digital-to-analog converter chip of model BH2226FV. The digital-to-analog converter chip is configured with a data terminal, a clock terminal, a chip select terminal, and multiple output terminals. The output terminals of the digital-to-analog converter chip are the output terminals of the digital-to-analog converter module. The first output terminal of the digital isolation chip is connected to the data terminal of the digital-to-analog converter chip, the second output terminal of the digital isolation chip is connected to the clock terminal of the digital-to-analog converter chip, and the third output terminal of the digital isolation chip is connected to the chip select terminal of the digital-to-analog converter chip. The output terminals of the digital-to-analog converter chip are connected one-to-one with the signal amplification module.

[0009] As a further improvement to the above technical solution, the signal amplification module is configured to amplify the input voltage signal by two times and output it externally.

[0010] As a further improvement to the above technical solution, the signal amplification module includes an operational amplifier, resistor R1, and resistor R2. One end of resistor R1 is connected to ground, and the other end of resistor R1 is connected to the inverting input terminal of the operational amplifier. One end of resistor R2 is connected to the inverting input terminal of the operational amplifier, and the other end of resistor R2 is connected to the output terminal of the operational amplifier. The output terminal of the digital-to-analog converter module is connected to the non-inverting input terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the inverter port.

[0011] As a further improvement to the above technical solution, the signal amplification module also includes a capacitor C1 and a Zener diode D1. The output terminal of the operational amplifier is connected to ground through the capacitor C1, the output terminal of the operational amplifier is connected to the negative terminal of the Zener diode D1, and the positive terminal of the Zener diode D1 is connected to ground.

[0012] The beneficial effects of this utility model are as follows: This technical solution includes a controller module, a digital isolation module, and a digital-to-analog converter module. The digital isolation module is placed between the controller module and the digital-to-analog converter module, so that the controller module is indirectly connected to the digital-to-analog converter module through the digital isolation module, thereby improving the interference resistance and safety of the circuit and reducing the impact of voltage fluctuations from external circuits. Attached Figure Description

[0013] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is the circuit diagram of this utility model;

[0015] Figure 2 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0016] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0020] Reference Figure 1 and Figure 2 This application discloses an isolated multi-channel frequency converter control output circuit. In its first embodiment, it includes a frequency converter port, a controller module, a digital isolation module, a digital-to-analog converter module, and a signal amplification module. The digital-to-analog converter module has multiple output terminals. The number of signal amplification modules, the number of frequency converter ports, and the number of output terminals of the digital-to-analog converter module are the same. The controller module is connected to the digital isolation module, and the digital isolation module is connected to the digital-to-analog converter module. The output terminals of the digital-to-analog converter module are connected one-to-one with the signal amplification modules, and the signal amplification modules are connected one-to-one with the frequency converter ports.

[0021] Specifically, this embodiment includes the controller module, the digital isolation module, and the digital-to-analog converter module. The digital isolation module is positioned between the controller module and the digital-to-analog converter module, allowing the controller module to be indirectly connected to the digital-to-analog converter module through the digital isolation module. This improves the circuit's interference resistance and security, and reduces the impact of voltage fluctuations from external circuits.

[0022] As a further preferred embodiment, in this embodiment, the digital isolation module includes a digital isolation chip of model NSI8241. The digital isolation chip is configured with a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal. The controller module is configured with a data terminal, a clock terminal, and a chip select terminal. The data terminal of the controller module is connected to the first input terminal of the digital isolation chip, the clock terminal of the controller module is connected to the second input terminal of the digital isolation chip, the chip select terminal of the controller module is connected to the third input terminal of the digital isolation chip, and the first, second, and third output terminals of the digital isolation chip are connected to the digital-to-analog converter module.

[0023] As a further preferred embodiment, in this embodiment, the digital-to-analog converter module includes a digital-to-analog converter chip of model BH2226FV. The digital-to-analog converter chip is configured with a data terminal, a clock terminal, a chip select terminal, and multiple output terminals. The output terminals of the digital-to-analog converter chip are the output terminals of the digital-to-analog converter module. The first output terminal of the digital isolation chip is connected to the data terminal of the digital-to-analog converter chip, the second output terminal of the digital isolation chip is connected to the clock terminal of the digital-to-analog converter chip, and the third output terminal of the digital isolation chip is connected to the chip select terminal of the digital-to-analog converter chip. The output terminals of the digital-to-analog converter chip are connected one-to-one with the signal amplification module.

[0024] As a further preferred embodiment, in this embodiment, the signal amplification module is configured to amplify the input voltage signal by two times and output it externally.

[0025] More specifically, in this embodiment, the signal amplification module includes an operational amplifier, resistor R1, and resistor R2. One end of resistor R1 is connected to ground, and the other end of resistor R1 is connected to the inverting input of the operational amplifier. One end of resistor R2 is connected to the inverting input of the operational amplifier, and the other end of resistor R2 is connected to the output of the operational amplifier. The output of the digital-to-analog converter module is connected to the non-inverting input of the operational amplifier. The output of the operational amplifier is connected to the inverter port. The resistance values ​​of resistor R1 and resistor R2 are the same.

[0026] More preferably, in this embodiment, the signal amplification module further includes resistor R3, resistor R4, capacitor C1, and Zener diode D1. The digital-to-analog converter module is connected to the non-inverting input terminal of the operational amplifier through resistor R3. The output terminal of the operational amplifier is connected to ground through resistor R4 and capacitor C1. The negative terminal of Zener diode D1 is connected to the connection point of resistor R4 and capacitor C1, and the positive terminal of Zener diode D1 is connected to ground. The inverter port is connected to the connection point of resistor R4 and capacitor C1.

[0027] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An isolated multi-channel frequency converter control output circuit, characterized in that: The system includes inverter ports, a controller module, a digital isolation module, a digital-to-analog converter module, and a signal amplification module. The digital-to-analog converter module is configured with multiple output terminals. The number of signal amplification modules, the number of inverter ports, and the number of output terminals of the digital-to-analog converter module are the same. The controller module is connected to the digital isolation module, the digital isolation module is connected to the digital-to-analog converter module, the output terminals of the digital-to-analog converter module are connected to the signal amplification modules one-to-one, and the signal amplification modules are connected to the inverter ports one-to-one.

2. The isolated multiplexed frequency converter control output circuit of claim 1, wherein: The digital isolation module includes an NSI8241 digital isolation chip, which is configured with a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal. The controller module is configured with a data terminal, a clock terminal, and a chip select terminal. The data terminal of the controller module is connected to the first input terminal of the digital isolation chip, the clock terminal of the controller module is connected to the second input terminal of the digital isolation chip, the chip select terminal of the controller module is connected to the third input terminal of the digital isolation chip, and the first, second, and third output terminals of the digital isolation chip are connected to the digital-to-analog converter module.

3. The isolated multiplexed inverter control output circuit of claim 2, wherein: The digital-to-analog converter module includes a BH2226FV digital-to-analog converter chip. The digital-to-analog converter chip is configured with a data terminal, a clock terminal, a chip select terminal, and multiple output terminals. The output terminals of the digital-to-analog converter chip are the output terminals of the digital-to-analog converter module. The first output terminal of the digital isolation chip is connected to the data terminal of the digital-to-analog converter chip, the second output terminal of the digital isolation chip is connected to the clock terminal of the digital-to-analog converter chip, and the third output terminal of the digital isolation chip is connected to the chip select terminal of the digital-to-analog converter chip. The output terminals of the digital-to-analog converter chip are connected one-to-one with the signal amplification module.

4. The isolated multiplexed inverter control output circuit of claim 1, wherein: The signal amplification module is configured to amplify the input voltage signal by two times and output it externally.

5. The isolated multiplexed inverter control output circuit of claim 4, wherein: The signal amplification module includes an operational amplifier, resistors R1 and R2. One end of resistor R1 is connected to ground, and the other end of resistor R1 is connected to the inverting input of the operational amplifier. One end of resistor R2 is connected to the inverting input of the operational amplifier, and the other end of resistor R2 is connected to the output of the operational amplifier. The output of the digital-to-analog converter module is connected to the non-inverting input of the operational amplifier, and the output of the operational amplifier is connected to the inverter port.

6. The isolated multiplexed inverter control output circuit of claim 5, wherein: The signal amplification module also includes a capacitor C1 and a Zener diode D1. The output terminal of the operational amplifier is connected to ground through the capacitor C1. The output terminal of the operational amplifier is connected to the negative terminal of the Zener diode D1, and the positive terminal of the Zener diode D1 is connected to ground.

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