KR101540062B1 - Transducer for isolating signal - Google Patents

Abstract

The present invention relates to a signal insulating converter. According to an aspect of the present invention, the signal insulating converter comprises: an analog-digital converting unit which converts an analog signal inputted from the outside into the predetermined bit number of digital signals, and has an output terminal per bit to output the digital signal per bit according to the bit number; an optical insulating unit which includes optical insulating devices which are respectively corresponded and connected to the output terminal per bit, and insulate the digital signal per bit; and a digital-analog converting unit which converts the digital signal which is insulated per bit in the optical insulating unit into an analog output signal in a predetermined voltage range.

Description

{TRANSDUCER FOR ISOLATING SIGNAL}

The present invention relates to a signal isolation converter, and more particularly, to a signal isolation converter for isolating a signal in outputting an output signal corresponding to an input signal.

The signal isolation transducer electrically isolates the input and output signals. The signal isolation transducer allows the input and output signals to have a separate neutral point (ground), so that the two circuits are electrically isolated completely from the insulation part, but the signal to be transmitted can maintain the value normally. The use of signal isolation transducers can include signal transfer prevention, equipment protection, noise suppression, signal grounding, and clarification of the breakpoints needed to divide the benefits between connected devices.

4 shows a circuit diagram for explaining a signal isolation converter according to the prior art. The signal isolation converter according to the related art receives an analog signal and outputs an isolated analog signal through an isolation part made of isolation OP-AMP or a transformer.

The signal isolation transformer according to the related art has a limitation in response speed of about 1 m sec due to the output delay characteristic of the isolation OP-AMP or the transformer, and there is a limitation that the ground on the input / output side is not physically separated completely.

In addition, the conventional signal insulation transducer has a disadvantage in that it is difficult to adjust the output distortion due to physical characteristics, signal conversion characteristics, or the like, or is implemented by a complicated configuration.

KR 20-2011-0009653 U US 6323796 B1 US 8731407 B2

An object of the present invention is to provide a signal isolation converter that converts an analog signal input from the outside into a binary digital signal, isolates the digital signal bit by bit, converts the analog signal into an analog output signal, and improves the isolation characteristic and the response speed.

It is another object of the present invention to provide a signal isolation converter for outputting an analog output signal followed or amplified to an input analog signal.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

According to an aspect of the present invention, there is provided a signal isolation converter for converting an analog signal input from the outside into a digital signal having a preset number of bits, and for outputting a digital signal according to the number of bits, An optical isolator for isolating a digital signal by a bit, the optical isolator comprising: an analog-to-digital converter having a separate output stage; And a digital-to-analog conversion section for converting the analog output signal into an analog output signal having a set voltage range.

According to another aspect of the present invention, there is provided a signal isolation converter including an analog-to-digital converter having a bit-by-bit output stage for converting an analog signal input from the outside into a digital signal of a predetermined number of bits, An optical isolator for isolating a digital signal by a bit, the optical isolator including optical isolators connected to corresponding output terminals of the respective bits; A digital-to-analog converter for converting a digital signal outputted as the digital data value is adjusted by the digital data adjusting unit into an analog output signal of a predetermined voltage range, And a conversion unit.

According to the present invention, it is possible to improve an insulation characteristic and a response speed in isolating an analog signal input from the outside and outputting an insulated analog output signal.

According to the present invention, there is an advantage that the isolation characteristic and the response speed of a signal can be improved by converting an analog signal into a binary digital signal and then inserting the digital signal into each bit.

Further, according to the present invention, there is an advantage that the digital data value of the isolated digital signal can be corrected or changed.

1 is a block diagram illustrating a signal isolation converter according to an embodiment of the present invention;
2 is a circuit diagram illustrating a signal isolation converter according to another embodiment of the present invention;
3 is a block diagram illustrating a signal isolation converter according to another embodiment of the present invention;
4 is a circuit diagram for explaining a signal isolation converter according to the prior art;
5 is a graph illustrating a response speed of an analog output signal to an analog signal input from the outside in a signal isolation converter according to an embodiment of the present invention.
FIG. 6 is a graph illustrating a response speed of an analog output signal to an analog signal input from the outside in a signal isolation converter according to the related art; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various different forms, and these embodiments are not intended to be exhaustive or to limit the scope of the present invention to the precise form disclosed, It is provided to inform the person completely of the scope of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the signal isolation transducers 10 and 11 according to the embodiments of the present invention will be described with reference to the drawings. 1 is a block diagram illustrating a signal isolation converter 10 according to an embodiment of the present invention. 2 is a circuit diagram for explaining a signal isolation converter 11 according to another embodiment of the present invention. In Fig. 1 and Fig. 2, substantially identical configurations are denoted by the same reference numerals.

The signal isolation transducers 10 and 11 according to the embodiments of the present invention include an analog-digital converter 100, a light-isolator 200, and a digital-analog converter 400.

The analog-to-digital converter 100 converts an analog signal Vin input from the outside into a digital signal of a predetermined number of bits.

The analog-to-digital conversion unit 100 has an input terminal for receiving the analog signal Vin and a bit-by-bit output terminal for outputting the digital signal according to the number of bits, respectively.

The analog-to-digital converter 100 binarizes the analog signal Vin according to a predetermined number of bits (for example, 8 bits) and converts the analog signal Vin into a digital signal.

For example, when an analog signal is converted to an 8-bit digital signal with a voltage input having a voltage level between 0V and 5V, the 0V input may be converted to a digital signal of 00000000, and the 5V input may be converted to a digital signal of 11111111 And an analog signal having a voltage level of more than 0 V and less than 5 V may be converted into a digital signal having a binary value between 00000001 and 11111110 corresponding to the voltage level.

The analog-to-digital conversion unit 100 has a bit-by-bit output stage for outputting the corresponding binarized values for each bit. For example, in order to output an 8-bit digital signal, the analog-to-digital conversion unit 100 may be composed of a bit-by-bit output stage having eight output stages. When a digital signal having a value of 00000000 is output, Eight outputs from the bit output stage to the most significant bit output stage may output signals below the predetermined voltage level. When outputting a digital signal having a value of 11111111, eight bits from the least significant bit output stage to the most significant bit output stage Output terminals may output signals having a predetermined voltage level or higher (for example, a voltage signal having a voltage level of 5V). Similarly, the analog-to-digital conversion unit 100 may output a digital signal having a binary number between 00000001 and 11111110 as a signal having a voltage level corresponding to each bit.

The optical isolator 200 includes optical isolators corresponding to the bit-by-bit output terminals, and isolates the digital signals bit by bit. Meanwhile, the digital signal isolated by the bit in the optical isolator 200 includes digital data values binarized on a bit-by-bit basis.

The signal isolation transducers 10 and 11 according to the embodiments of the present invention include a light insulation part 200 composed of optical insulation elements to insulate digital signals by bits and improve the response performance in digital signal transmission can do.

2, the optical isolator 200 includes a plurality of light emitting diodes 210 and a plurality of phototransistors 220 connected to corresponding output terminals of respective bits.

Here, the light emitting diode 210 outputs an optical signal when a signal of a predetermined voltage level is output at a bit-by-bit output terminal, the phototransistor 220 is connected to a resistor whose one end is connected to the power supply, Bit input terminal of the light emitting diode 400 and receives an optical signal from the light emitting diode 210, the predetermined voltage may be applied to each bit input terminal.

The digital-analog converter 400 converts the digital signal isolated by the bit in the optical isolator 200 into an analog output signal Vout of a predetermined voltage range.

The digital-to-analog conversion unit 400 has a bit-by-bit input terminal for receiving a bit-insulated digital signal bit by bit in the optical isolator 200 and an output terminal for outputting an analog output signal Vout.

Hereinafter, the response speeds of the signal isolation converter according to the embodiment of the present invention and the signal isolation converter according to the related art will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 is a graph showing a response speed of an analog output signal to an analog signal input from the outside in the signal isolation converter 11 according to the embodiment of the present invention. FIG. 6 is a graph showing a response speed Is a graph showing a response speed of an analog output signal to an analog signal input from the outside in an insulated converter.

Here, the horizontal axis in FIG. 5 is a time axis of 10 μs in units of time, and the vertical axis represents the signal size. Reference numeral 801 denotes a waveform of an analog signal Vin input from the outside, and 802 denotes a waveform of the analog output signal Vout. The horizontal axis in Fig. 6 is the time axis of 200 μs in units of time, and the vertical axis represents the signal size. Reference numeral 901 denotes a waveform of an analog signal (input signal) input from the outside, and 902 denotes a waveform of an analog output signal (output signal).

In the case of FIG. 5 according to the present invention, after the analog signal Vin input from the outside is changed from the off state to the on state, the analog output signal Vout is turned off (On) state. On the other hand, in the case of FIG. 6 according to the related art, after the analog signal input from the outside is changed from the off state to the on state, the analogue output signal is turned off ) State to the on state (On state).

The signal isolation transformer according to the related art has an advantage in that the response delay due to insulation can be reduced by isolating the digital signal according to the embodiment of the present invention while isolating the analog signal itself, It can be seen that the signal isolation transformer according to the embodiment can reduce the response speed by about 95.153% in comparison with the signal isolation transformer according to the related art.

Hereinafter, a signal isolation converter according to another embodiment of the present invention will be described with reference to FIG. 3 is a block diagram illustrating a signal isolation converter 12 in accordance with another embodiment of the present invention.

The signal isolation converter 12 according to another embodiment of the present invention includes an analog-to-digital conversion unit 100, a light isolation unit 200, a digital data adjustment unit 300, a comparator 350, And a conversion unit 400.

1 and 2, the analog-digital converter 100, the optical isolator 200, and the digital-analog converter 400 of the signal isolation converter 12 according to another embodiment of the present invention Digital converter 100, the optical isolator 200, and the digital-analog converter 400 of the signal isolation converter 10, 11 according to the embodiments of the present invention described above, The digital data adjustment unit 300 and the comparator 350 will be mainly described in order to simplify the description and to avoid the detailed description.

The comparator 350 may receive the analog output signal Vout from the digital-analog converter 400 and the analog signal Vin from the analog-digital converter 100 and may compare the analog output signal Vout with the analog output signal Vout) and the analog signal Vin as a result of comparing them with each other. Here, the comparator 350 may be an OP-AMP that operates as a subtractor.

The digital data adjustment unit 300 corrects or changes the value of the digital data for each bit based on the differential signal of the comparator 350 or the input signal IN from the outside.

The digital data adjustment unit 300 may change the digital data value of each bit of the digital signal insulated by bits in the optical insulation unit 200 to have a bit value or to have another digital data value. On the other hand, the digital data value can be recognized as a binary value by being divided into 0 or 1 based on a predetermined voltage level.

The digital data adjustment unit 300 may change the digital data value bit by bit so that the voltage level of the difference signal is less than a predetermined value.

For example, if the analog input signal Vin is 5V and the analog output signal Vout is 4V, the difference signal may have a voltage level of 1V. At this time, the digital data adjustment unit 300 changes the digital data value so as to compensate for the digital signal insulated by the difference signal (1V). If the binarized value corresponding to the difference signal 1V is 00000001, the digital data adjustment unit 300 adds the compensation value 00000001 to the signal transmitted through the analog-digital conversion unit 100 and the optical insulation unit 200 And provides the added value to the digital-analog converter 400 so that the difference signal can be compensated.

Accordingly, the signal isolation converter 12 according to another embodiment of the present invention includes the digital data adjustment unit 300 and the comparator 350, so that the output signal according to the signal conversion characteristic in the digital- It is possible to compensate for the offset and output the analog output signal Vout that follows the analog input signal Vin.

On the other hand, the digital data adjustment unit 300 may level shift and change the value of the bit-by-bit digital data based on the input signal IN from the outside. The input signal IN may be a voltage signal of a predetermined voltage range or a dimming signal. The digital data adjustment unit 300 may be connected to an input means such as a dip switch (DIP SW) in order to receive the input signal IN from the outside.

When the input signal IN is input from the outside, the digital data adjustment unit 300 may change the value of the digital data by level shift sequentially or non-sequentially from the lower bit to the upper bit.

On the other hand, the signal isolation converter 12 can operate as a signal amplifier according to the degree to which the digital data adjustment unit 300 level shifts the value of the digital data.

For example, if the digital signal output from the optical isolator 200 has a binary-converted value of 00011000 (decimal number: 24), the digital data adjustment unit 300 level shifts to 1Bit upper bits to obtain 00110000 (decimal number: 48) It is possible to convert the digital signal into a digital signal having a binary value of. At this time, if the digital-analog converter 400 is assumed to be ideal, the analog output signal Vout may have a voltage level twice amplified from the analog input signal Vin.

The digital-analog converter 400 converts the digital signal output from the digital data controller 300 into a digital output signal Vout of a predetermined voltage range.

The digital-to-analog conversion unit 400 has a bit-by-bit input terminal for receiving a digital signal whose bits are adjusted by the digital data adjusting unit 300, and an output terminal for outputting an analog output signal Vout .

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

10, 11: Signal Isolation Transducer,
100: an analog-to-digital converter,
200: optical isolator,
210: light emitting diode,
220: photo transistor,
300: digital data adjustment section,
350: comparator,
400: Digital-to-analog conversion section.

Claims (6)

delete delete delete An analog-to-digital converter having an output terminal for each bit for converting an analog signal input from the outside into a digital signal of a predetermined number of bits and outputting the digital signal for each bit according to the number of bits;
An optical isolator for isolating the digital signal by bits, the optical isolator being connected to the bit-by-bit output terminals, respectively;
A digital data adjustment unit for adjusting a digital signal by maintaining a bit-by-bit digital data value of the digital signal in the optical insulation unit or changing it to have another digital data value; And
A digital-to-analog converter converting the digital signal output from the digital data adjuster to an analog output signal of a predetermined voltage range;
/ RTI > 5. The method of claim 4,
And a comparator for receiving an analog output signal from the digital-analog converter and an analog signal from the analog-to-digital converter and outputting a difference signal according to comparison between the analog output signal and the analog signal,
Wherein the digital data adjustment unit corrects the digital data value for each bit so that the voltage level of the differential signal of the comparator is equal to or less than a predetermined value
In signal isolation transducer. The digital data processing apparatus according to claim 4,
Level shifting of the value of the bit-by-bit digital data based on an input signal from the outside
In signal isolation transducer.

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