CN115441857A - Device supporting multi-channel simultaneous output of analog signals - Google Patents

Device supporting multi-channel simultaneous output of analog signals Download PDF

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Publication number
CN115441857A
CN115441857A CN202111626782.6A CN202111626782A CN115441857A CN 115441857 A CN115441857 A CN 115441857A CN 202111626782 A CN202111626782 A CN 202111626782A CN 115441857 A CN115441857 A CN 115441857A
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China
Prior art keywords
circuit
output
electrically connected
resistor
module
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郑伟建
林钢
汤锴
胡宇婷
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Zhejiang Supcon Technology Co Ltd
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Zhejiang Supcon Technology Co Ltd
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Priority to CN202111626782.6A priority Critical patent/CN115441857A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/002—Switching arrangements with several input- or output terminals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/14—Modifications for compensating variations of physical values, e.g. of temperature
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/017545—Coupling arrangements; Impedance matching circuits
    • H03K19/017572—Coupling arrangements; Impedance matching circuits using opto-electronic devices

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Electronic Switches (AREA)

Abstract

The invention discloses a device for supporting multi-channel simultaneous output of analog signals, which comprises: the device comprises a power supply module, a main control module and a conversion output module; the power supply module is respectively electrically connected with the main control module and the conversion output module and is used for providing working voltage for the main control module and providing a voltage reference source for the conversion output module; the main control module is electrically connected with the conversion output module and is used for controlling the channels, the sizes and the number of the analog signals output by the conversion output module; the conversion output module is used for receiving the voltage reference source to perform V/I conversion output and resistance output. The invention can output 32 channels of resistance signals or 16 channels of current signals simultaneously. In addition, current output or resistance output with different fixed values can be realized, point isolation among channels is realized, the current precision is high, and the temperature drift is low. A device for inputting signals is provided, wherein current or resistance signals can be input simultaneously in multiple channels. The input interface and the output interface are connected, and the operation is convenient.

Description

Device supporting multi-channel simultaneous output of analog signals
Technical Field
The invention belongs to the field of analog signal testing, and particularly relates to a device for supporting multi-channel simultaneous output of analog signals.
Background
Industrial control refers to industrial automation control and is mainly realized by combining electronics, electricity, machinery and software. I.e., industrial control, or factory automation. Mainly means that the production and the manufacturing process of a factory are more automated, efficient and accurate by using a computer technology, a microelectronic technology and an electrical means, and the method has controllability and visibility.
Nowadays, the products in the industrial control industry need to input analog quantity signals such as current and resistance tests when leaving the factory. Typically, the single channel input is provided by a dedicated instrument, which is inefficient in the face of multiple channel outputs. A device capable of multi-channel simultaneous output is required.
Disclosure of Invention
The technical purpose of the present invention is to provide a device for supporting multiple channels to output analog signals simultaneously, so as to solve the technical problem of low analog signal output efficiency.
In order to solve the problems, the technical scheme of the invention is as follows:
an apparatus for supporting simultaneous output of analog signals in multiple channels, comprising: the device comprises a power supply module, a main control module and a conversion output module;
the power supply module is respectively electrically connected with the main control module and the conversion output module and is used for providing working voltage for the main control module and providing a conversion reference source for the conversion output module;
the main control module is electrically connected with the conversion output module and is used for controlling the channels, the sizes and the number of the analog signals output by the conversion output module;
the conversion output module is used for receiving the voltage reference source to perform V/I conversion output and resistance output.
Specifically, the power supply module comprises a power supply interface, a voltage reduction circuit, a voltage reference circuit and a DC-DC circuit;
the power interface is respectively electrically connected with the voltage reduction circuit and the DC-DC circuit and is used for receiving 24V voltage from the outside and supplying the voltage to the DC-DC circuit, and receiving 5V voltage from the outside and supplying the voltage to the voltage reduction circuit;
the voltage reduction circuit is electrically connected with the voltage reference circuit and the main control module and is used for reducing the voltage of 5V to 3.3V and transmitting the voltage to the main control module;
the DC-DC circuit is used for receiving 24V voltage and converting the voltage into 2 isolated 23V voltage to be input to the voltage reference circuit and the conversion output module;
the voltage reference circuit is used for receiving 23V voltage from the DC-DC circuit, converting the 23V voltage to obtain 5V reference voltage, and switching and outputting different voltage values to the conversion output module through the voltage division circuit.
Specifically, the power interface comprises a TVS tube, a fuse, a first diode, a first inductor, a first capacitor, a second capacitor and a first resistor;
one end of the TVS tube is electrically connected with the input end of the power interface and one end of the fuse respectively, the other end of the fuse is electrically connected with the anode of the first diode, the other end of the first diode is electrically connected with one end of the first inductor and one end of the first capacitor respectively, and the other end of the first inductor is electrically connected with one end of the second capacitor and the output end of the power interface respectively;
the other end of TVS pipe is connected and all ground connection with the other end of first electric capacity, the other end of second electric capacity and the one end electricity of first resistance respectively, and the other end ground connection of first resistance.
Specifically, a plurality of DC-DC circuits are arranged, and each DC-DC circuit comprises a D242323S chip, a third capacitor, a fourth capacitor, a second diode and a third diode;
the D242323S chip is used for receiving a 24V current source and converting the current source into 2 paths of isolated 23V power supplies;
in one path, the output end of the D242323S chip is respectively and electrically connected with one end of a third capacitor, the cathode of a second diode and a voltage reference circuit, and the other end of the third capacitor and the anode of the second diode are grounded;
in the other path, the other output end of the D242323S chip is respectively and electrically connected with one end of a fourth capacitor, the cathode of a third diode and the voltage reference circuit, and the other end of the fourth capacitor and the anode of the third diode are grounded.
Specifically, a plurality of voltage reference circuits are provided, and the number of the voltage reference circuits corresponds to the number of the DC-DC circuits;
the voltage reference circuit comprises an ADR02BRZ chip, a CD4052 chip, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a fifth capacitor;
one end of the second resistor is an input end of the voltage reference circuit, the other end of the second resistor is respectively electrically connected with one end of the fifth capacitor and the VIN port of the ADR02BRZ chip, the other end of the fifth capacitor is respectively electrically connected with the COM port of the ADR02BRZ chip and one end of the third resistor and is grounded, the other end of the third resistor is electrically connected with one end of the fourth resistor, the other end of the fourth resistor is electrically connected with one end of the fifth resistor, the other end of the fifth resistor is respectively electrically connected with the VOUT port of the ADR02BRZ chip and the input port of the CD4052 chip, and the output end of the CD4052 chip is electrically connected with the conversion output module.
Specifically, the conversion output module comprises a current source output circuit, a channel switching circuit, a resistance output circuit and an output interface circuit;
the current source output circuit is respectively electrically connected with the voltage reference circuit, the channel switching circuit and the main control module, is controlled by the main control module, and is used for receiving the current output by the voltage reference circuit, realizing V/I transverse current conversion, obtaining a current signal and outputting the current signal;
the channel switching circuit is electrically connected with the output interface circuit, is controlled by the main control module, and is used for receiving the current signal of the current source output circuit, selecting different channels to switch and output the current signal to the output interface circuit and then transmitting the current signal to the outside;
the resistance output circuit is respectively electrically connected with the main control module and the output interface circuit, is controlled by the main control module, and is used for outputting resistance signals, selecting different channels to switch and output the resistance signals to the output interface circuit and then transmitting the resistance signals to the outside.
Specifically, a plurality of current source output circuits are arranged, wherein each current source output circuit comprises an operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a sixth capacitor, a first impedance, an MOS (metal oxide semiconductor) tube, a fourth diode, a fifth diode, a first photoelectric coupler and a second photoelectric coupler;
the positive phase input end of the operational amplifier is electrically connected with the voltage reference circuit, the negative phase input end of the operational amplifier is electrically connected with the source electrode of the MOS tube and one end of a seventh resistor respectively, the other end of the seventh resistor is grounded, the negative electrode of the operational amplifier is grounded, the output end of the operational amplifier is electrically connected with one end of a sixth resistor, and the other end of the sixth resistor is electrically connected with the drain electrode of the MOS tube;
the positive electrode of the operational amplifier is electrically connected with one end of a sixth capacitor and one end of a first impedance respectively, the other end of the first impedance is electrically connected with one end of a first photoelectric coupler, the other end of the corresponding first photoelectric coupler is the output end of a current source output circuit, the other end of the sixth capacitor is electrically connected with the grid electrode of the MOS tube and the negative electrode of a fourth diode respectively, the positive electrode of the fourth diode is electrically connected with one end of a second photoelectric coupler, and the other end of the corresponding second photoelectric coupler is the other output end of the current source output circuit;
one end of the eighth resistor is electrically connected with the fixed power supply, the other end of the eighth resistor is electrically connected with the control end of the first photoelectric coupler, the other control end of the first photoelectric coupler is electrically connected with the control end of the second photoelectric coupler, and the other control end of the second photoelectric coupler is electrically connected with the main control module.
Specifically, a plurality of channel switching circuits are arranged, and each channel switching circuit comprises a switching sub-circuit and a control sub-circuit;
the switching sub-circuit comprises a first switch and a second switch, the first switch is controlled by the control sub-circuit to switch channels, and the second switch is controlled by the control sub-circuit to switch channels;
the control sub-circuit comprises a relay, a fifth diode, a photodiode, an eighth resistor, a ninth resistor, a tenth resistor and a first triode;
one end of the relay is respectively electrically connected with the cathode of the fifth diode and the anode of the photodiode, the cathode of the photodiode is electrically connected with the eighth resistor, the other end of the relay is respectively electrically connected with the anode of the fifth diode, the other end of the eighth resistor and the collector of the first triode, the base of the first triode is respectively electrically connected with one end of the ninth resistor and one end of the tenth resistor, the other end of the ninth resistor is respectively electrically connected with the main control module, and the other end of the tenth resistor is electrically connected with the emitter of the first triode and grounded.
Specifically, a plurality of resistance output circuits are arranged, and each resistance output circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third photoelectric coupler and a fourth photoelectric coupler;
one end of the third photoelectric coupler is an input end of the resistor output circuit, the other end of the third photoelectric coupler is electrically connected with one end of the twelfth resistor, and the other end of the twelfth resistor is electrically connected with the output interface circuit;
one end of a fourth photoelectric coupler is an input end of the resistor output circuit, the other end of the fourth photoelectric coupler is electrically connected with one end of a thirteenth resistor, and the other end of a twelfth resistor is electrically connected with the output interface circuit;
one end of the eleventh resistor is electrically connected with the fixed power supply, the other end of the eleventh resistor is electrically connected with the control end of the third photoelectric coupler, the other control end of the third photoelectric coupler is electrically connected with the control end of the fourth photoelectric coupler, and the other control end of the fourth photoelectric coupler is electrically connected with the main control module.
Specifically, the main control module comprises a CPU circuit, a key circuit and a logic control circuit;
the CPU circuit is respectively and electrically connected with the key circuit and the logic control circuit, the CPU circuit comprises a CPU and a CPU peripheral circuit, and the CPU circuit is used for controlling the logic control circuit to output a control logic signal to the conversion output module so as to adjust the analog signal output of the conversion output module;
the key circuit is used for inputting a control instruction to the CPU circuit so as to change the output of the logic control circuit;
the logic control circuit is electrically connected with the conversion output module and is used for controlling the output of the conversion output module.
Further preferably, the intelligent control system further comprises a 485 communication circuit, wherein the 485 communication circuit is electrically connected with the CPU circuit and is used for communicating the CPU in the CPU circuit with an external upper computer so as to realize automatic control.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
the invention can output 32 channels of resistance signals or 16 channels of current signals simultaneously. In addition, current output or resistance output with different fixed values can be realized, the current precision is high, and the temperature drift is low. A device for inputting signals is provided, wherein current or resistance signals can be input simultaneously in multiple channels. The input interface and the output interface are connected, and the operation is convenient.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a block diagram of an apparatus for supporting simultaneous output of analog signals in multiple channels according to the present invention;
FIG. 2 is a circuit diagram of the power interface of the present invention;
FIG. 3 is a circuit schematic of the DC-DC circuit of the present invention;
FIG. 4 is a circuit schematic of a voltage reference circuit of the present invention;
FIG. 5 is a circuit diagram of the current source output circuit of the present invention;
FIG. 6 is a circuit diagram of a channel switching circuit according to the present invention;
FIG. 7 is a circuit diagram of a resistive output circuit according to the present invention;
FIG. 8 is a schematic circuit diagram of a CPU peripheral circuit and a key circuit according to the present invention;
FIG. 9 is a circuit diagram of the logic control circuit of the present invention;
fig. 10 is a circuit schematic of a 485 communication circuit of the present invention.
Description of the reference numerals
R1: a first resistor; r2: a second resistor; r3: a third resistor; r4: a fourth resistor; r5: a fifth resistor; r6: a sixth resistor; r7: a seventh resistor; r8: an eighth resistor; r9: a ninth resistor; r10: a tenth resistor; r11: an eleventh resistor; r12: a twelfth resistor; r13: a thirteenth resistor; c1: a first capacitor; c2: a second capacitor; c3: a third capacitor; c4: a fourth capacitor; c5: a fifth capacitor; c6: a sixth capacitor; d1: a first diode; d2: a second diode; d3: a third diode; d4: a fourth diode; d5: a fifth diode; l1: a photodiode; z1: a first impedance.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. Moreover, in the interest of brevity and understanding, only one of the components having the same structure or function is illustrated schematically or designated in some of the drawings. In this document, "a" means not only "only one of this but also a case of" more than one ".
An apparatus for supporting multiple channels to output analog signals simultaneously according to the present invention is further described in detail with reference to the accompanying drawings and the specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Examples
Referring to fig. 1, the present embodiment provides an apparatus for supporting multiple channels to output analog signals simultaneously, which is used for switching inputs of multiple channels of different analog signals, and comprises: the device comprises a power module, a main control module and a conversion output module. The power supply module is respectively electrically connected with the main control module and the conversion output module and is used for providing working voltage for the main control module and providing a reference source for the conversion output module. The main control module is electrically connected with the conversion output module and is used for controlling the channels, the size and the number of the analog signals output by the conversion output module. The conversion output module is used for receiving the voltage reference source to perform V/I conversion so as to realize constant current source output and resistance output.
Referring to fig. 1, a power module includes a power interface, a voltage step-down circuit, a voltage reference circuit, and a DC-DC circuit. From the overall operation process, the power interface receives 24V and 5V source currents from the outside, wherein the 24V source current is divided into 2 paths, one path of the 24V source current is filtered to provide working voltage for a relay of the channel switching circuit (which will be described in detail later), and the other path of the 24V source current enters the DC-DC circuit to generate 2 mutually isolated 23V voltages and is transmitted to the voltage reference circuit and the current source output circuit of the conversion output module. The voltage reference circuit receives 2 paths of 23V voltage and converts the voltage into 5V reference voltage, and the CD4052 realizes switching output of different voltage values through the voltage division circuit and transmits the switching output to a current source output circuit in a subsequent conversion output module. The voltage of 5V then can enter the step-down circuit and step down to 3.3V through LM1117 and can be for CPU among the host control module, photoelectric coupler etc. supply power.
Referring to fig. 2, a circuit of the power interface for transmitting a 24V source current in the present embodiment is shown, and specifically includes a TVS tube, a fuse, a first diode D1, a first inductor, a first capacitor C1, a second capacitor C2, and a first resistor R1. After entering the power interface, the source current firstly plays a role of protecting a circuit through the TVS tube which is arranged in parallel with the fuse, and then enters the first diode D1 through the fuse. After coming out of the first diode D1, the current enters the type filter circuit for filtering and is finally output. The filter circuit comprises a first inductor, a first capacitor C1 and a second capacitor C2, wherein the first inductor is respectively connected with the first capacitor C1 and the second capacitor C2 in parallel, the input point of current is positioned between the first inductor and the first capacitor C1, and the output point is positioned between the first inductor and the second capacitor C2. Similarly, the first resistor R1 is connected in parallel with a capacitor and the second capacitor C2, and the potential of the first resistor R1 is 0.
Referring to fig. 1 and 3, fig. 3 shows a DC-DC circuit of this embodiment, in which 8 DC-DC circuits with the same arrangement are provided, and one example thereof is described in detail. The DC-DC circuit comprises a D242323S chip, a third capacitor C3, a fourth capacitor C4, a second diode D2 and a third diode D3. The 24V current source is input to the Vin terminal of the D242323S chip, the ground terminal of the D242323S chip is grounded, and two output terminals are Vout1 and Vout2. After passing through the D242323S chip, the 23V current output from the port Vout1 enters a voltage reference circuit, where a third capacitor C3 is connected in parallel with a second diode D2, and the 23V current output from the port Vout2 also enters a voltage reference circuit, where a fourth capacitor C4 is connected in parallel with a third transistor.
Referring to fig. 1 and 4, as the current is transmitted into the voltage reference circuits, in particular, 16 voltage reference circuits are provided. The voltage reference circuit comprises an ADR02BRZ chip, a CD4052 chip, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a fifth capacitor C5. The ADR02BRZ chip converts the received +23V current into +5V current with high precision and low temperature drift for output, the output end is provided with a high-precision resistor for voltage division, and the high-precision resistor is selected by the CD4052 chip and is transmitted to a current source output circuit of the conversion output module.
Explaining according to the trend of the current, the current is divided into two branches by the second resistor R2, one branch directly enters a VIN port of the ADR02BRZ chip, the other branch is grounded after passing through the fifth capacitor C5, VOUT (Voltage output) of the ADR02BRZ chip is subjected to voltage division by the fifth resistor R5, the fourth resistor R4 and the third resistor R3 to obtain +5V current with high precision and low temperature drift, the +5V current is input to the CD4052 chip, and then the CD4052 chip is selectively output to the current source output circuit.
Referring to fig. 1, in particular, the conversion output module includes a current source output circuit, a channel switching circuit, a resistance output circuit, and an output interface circuit. The current source output circuit is respectively electrically connected with the voltage reference circuit, the channel switching circuit and the main control module, is controlled by the main control module, and is used for receiving the current output by the voltage reference circuit, realizing V/I cross current conversion, obtaining a current signal and outputting the current signal. The channel switching circuit is electrically connected with the output interface circuit, is controlled by the main control module, and is used for receiving the current signal of the current source output circuit, selecting different channels to switch and output the current signal to the output interface circuit and then transmitting the current signal to the outside. The resistance output circuit is respectively electrically connected with the main control module and the output interface circuit, is controlled by the main control module, and is used for outputting resistance signals, selecting different channels to switch and output to the output interface circuit and then transmitting the resistance signals to the outside. The number of the output interface circuits can be up to 32, the connecting wire connecting probes can receive current signals and resistance signals and output the current signals and the resistance signals to the outside, and the channel requirements of most tests can be met.
Specifically, referring to fig. 1 and 5, the current output from the voltage reference circuit enters the current source output circuit. By using the high-precision dual-channel OPA2277 operational amplifier, the IRFU120MOS tube is used as emitter follower output to form a current negative feedback circuit, and the V/I conversion realizes high-precision cross current output, so that the output current I (1 +) = VREF1/R7.
Referring to fig. 5, in particular, in this embodiment, a total of 16 identical current source output circuits are provided, and are powered by 16 mutually isolated 23V power supplies, so that the point points of the 16 current sources are isolated, taking one of the 16 current sources as an example. The current source output circuit comprises an operational amplifier with the model of OPA2277, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a sixth capacitor C6, a first impedance Z1, an MOS (metal oxide semiconductor) tube with the model of IRFU120, a fourth diode D4, a fifth diode D5, a first photoelectric coupler and a second photoelectric coupler. Along the current moving direction, the input end of the current source output circuit, i.e. the current in VREF1, enters the non-inverting input end of the operational amplifier, the inverting input end of the current source output circuit is electrically connected with the source electrode of the MOS transistor and one end of the seventh resistor R7, and the other end of the seventh resistor R7 is grounded. Then, the current flows from the output end of the operational amplifier to the drain electrode of the MOS tube through the sixth resistor R6. The power end of the operational amplifier is connected with a power supply, and the grounding end is grounded. The grid electrode of the MOS tube is respectively and electrically connected with one end of the sixth capacitor C6 and the negative electrode of the fourth diode D4. The other end of the sixth capacitor C6 outputs a current signal I (1 +) = VREF1/R7 via the first impedance Z1, and one end of the anode of the fourth diode D4 outputs a current signal 1-. Subsequently, the current is output from the 1+ end through the first impedance Z1, enters the first photoelectric coupler relay and is output from the other end of the first photoelectric coupler, the current output from the 1-end enters the second photoelectric coupler and is output from the other end of the second photoelectric coupler, and whether the current source output circuit outputs a current signal is controlled by controlling the first photoelectric coupler and the second photoelectric coupler. Specifically, the eighth resistor R8 is connected to a 3.3V fixed power supply, and finally enters the main control module through the eighth resistor R8, the control end of the first photoelectric coupler and the control end of the second photoelectric coupler in sequence, so that whether the first photoelectric coupler and the second photoelectric coupler are conducted or not is controlled by the main control module.
Referring to fig. 1 and 6, the channel switching circuit is used for switching and outputting different channels of current, different reference voltages are selected to be output to the operational amplifier by using the CD4052 to realize different current outputs, channel switching of the current source is realized by using the relay, and 16 current sources correspond to the channel switching circuit of 16 two-way relays, so that 32 channel outputs exist.
Referring to fig. 6, taking 1 channel switching circuit as an example, the channel switching circuit can be divided into a switching sub-circuit and a control sub-circuit. The switching sub-circuit comprises a first switch and a second switch, one path of current signal output from the current source output circuit is input to the output interface circuit through the first switch, and the other path of current signal is input to the output interface circuit through the second switch and enters the output interface circuit. The states of the first switch and the second switch are controlled by the relay of the control sub-circuit. The control sub-circuit comprises a relay, a fifth diode D5, a photodiode L1, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a first triode. The photodiode L1 is connected in series with the eighth resistor R8, and is connected in parallel with the fifth diode D5 and the relay. Therefore, the 24V supply current will be divided into three paths, the first path enters the collector of the first triode through the relay, the second path enters from the negative electrode of the fifth diode D5 and then is connected with the collector of the first triode, and the third path enters the collector of the first triode through the photodiode L1 and the eighth resistor R8 in sequence. The control signal sent by the main control module is divided into two paths after passing through a ninth resistor R9, one path directly enters the base electrode of the first triode, the other path is grounded after passing through a tenth resistor R10, and the emitting electrode of the first triode is grounded.
Referring to fig. 1 and 7, the resistance output circuit is used for outputting resistance signals, and specifically, the present embodiment is provided with 16 resistance output circuits for outputting 32 resistance signals. Specifically, taking 1 resistor output circuit as an example, the resistor output circuit includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a third photocoupler, and a fourth photocoupler. One path of input signal is output after sequentially passing through the third photoelectric coupler and the twelfth resistor R12, and the other path of input signal is output after sequentially passing through the fourth photoelectric coupler and the thirteenth resistor R13. The fixed 3.3V power supply sequentially enters the main control module through the eleventh resistor R11, the control end of the third photoelectric coupler and the control end of the fourth photoelectric coupler, and the third photoelectric coupler and the fourth photoelectric coupler are controlled through the main control module, so that whether resistance signals are output or not is controlled.
Referring to fig. 1, 8 to 9, the main control module in this embodiment includes a CPU circuit, a key circuit, and a logic control circuit.
Referring to fig. 1 and 8, the CPU circuit is electrically connected to the key circuit and the logic control circuit, respectively, the CPU circuit includes a CPU and a CPU peripheral circuit, and the CPU has a model of LPC1114 and has a key control function, a logic control function, a reference voltage selection function, a 485 communication function, and the like. The CPU circuit is used for controlling the logic control circuit to output a control logic signal to the conversion output module so as to adjust the analog signal output of the conversion output module. The key circuit is used for inputting a control instruction to the CPU circuit so as to change the control signal output of the logic control circuit. Referring to fig. 9, the logic control circuit is electrically connected to each of the modules in the switching output module, and performs output control on the current source output circuit, the channel switching circuit, and the resistance output circuit. Specifically, 6 74HC595 are used as control elements to form a cascade circuit, control a relay and a photoelectric coupler to be switched on and off, and only 4I/O can control 48 signals to be output.
Referring to fig. 10, preferably, the wireless communication device further comprises a 485 communication circuit, wherein the 485 communication circuit is electrically connected with the CPU circuit and is used for communicating the CPU in the CPU circuit with an external upper computer, and a protocol programmed in the CPU can communicate with the upper computer to realize automatic control.
The principle and the using method of the embodiment are explained, the ADR02BRZ generates 5V reference voltage, the reference voltage is divided by the resistors to obtain different voltage value points, the reference voltage is connected to the input end of the CD4052 to realize different reference voltage outputs, then the reference voltage is connected to the OPA2277 operational amplifier to introduce negative feedback, the IRFU120MOS transistor performs follow-up output to realize different current outputs, and each current output end realizes channel switching output through the AQW212photo MOS transistor and the relay. The resistors realize the switching of different channels of resistor signals through the AQW212PHOTOMOS tube, the SN74HC595 controls the PHOTOMOS tube in a cascading mode to realize the switching output of various multi-channel different analog signals, and the control of the CPU can be controlled through keys or 485 communication. The user only needs to contact the interface needing to input signals at the 32 output interfaces of the device by a mode of connecting the probes through wires.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.

Claims (11)

1. An apparatus for supporting simultaneous output of analog signals in multiple channels, comprising: the device comprises a power supply module, a main control module and a conversion output module;
the power supply module is respectively electrically connected with the main control module and the conversion output module and is used for providing working voltage for the main control module and providing a voltage reference source for the conversion output module;
the main control module is electrically connected with the conversion output module and is used for controlling the channels, the size and the number of the analog signals output by the conversion output module;
the conversion output module is used for receiving the voltage reference source to perform V/I conversion output and resistance output.
2. The apparatus for supporting multiple channels to output analog signals simultaneously according to claim 1, wherein the power supply module comprises a power interface, a voltage reduction circuit, a voltage reference circuit and a DC-DC circuit;
the power interface is electrically connected with the voltage reduction circuit and the DC-DC circuit respectively and used for receiving 24V voltage from the outside to the DC-DC circuit; the voltage of 5V received from the outside is supplied to the voltage reduction circuit.
The voltage reduction circuit is electrically connected with the voltage reference circuit and the main control module and is used for reducing the voltage of 5V to 3.3V and transmitting the voltage to the main control module;
the DC-DC circuit is used for receiving 24V voltage and converting the voltage into 2 isolated 23V voltages which are input to the voltage reference circuit and the conversion output module;
the voltage reference circuit is used for receiving 23V voltage from the DC-DC circuit, converting the 23V voltage to obtain 5V reference voltage, and switching and outputting different voltage values to the conversion output module through the voltage division circuit.
3. The apparatus of claim 2, wherein the power interface comprises a TVS tube, a fuse, a first diode, a first inductor, a first capacitor, a second capacitor, and a first resistor;
one end of the TVS tube is electrically connected with the input end of the power interface and one end of the fuse respectively, the other end of the fuse is electrically connected with the anode of the first diode, the other end of the first diode is electrically connected with one end of the first inductor and one end of the first capacitor respectively, and the other end of the first inductor is electrically connected with one end of the second capacitor and the output end of the power interface respectively;
the other end of TVS pipe respectively with the other end of first electric capacity, the other end of second electric capacity with the one end electricity of first resistance is connected and all ground connection, the other end ground connection of first resistance.
4. The apparatus for supporting multiple channels to output analog signals simultaneously according to claim 2, wherein, a plurality of DC-DC circuits are provided, and each DC-DC circuit comprises a D242323S chip, a third capacitor, a fourth capacitor, a second diode and a third diode;
the D242323S chip is used for receiving a 24V power supply and converting the 24V power supply into a 2-path isolated 23V power supply;
in one path, the output end of the D242323S chip is respectively and electrically connected with one end of the third capacitor, the cathode of the second diode and the voltage reference circuit, and the other end of the third capacitor and the anode of the second diode are grounded;
in the other path, the other output end of the D242323S chip is electrically connected to one end of the fourth capacitor, the cathode of the third diode and the voltage reference circuit, respectively, and the other end of the fourth capacitor and the anode of the third diode are grounded.
5. The apparatus for supporting multiple channels to output analog signals simultaneously according to claim 4, wherein a number of the voltage reference circuits is provided, the number of the voltage reference circuits corresponding to the number of the DC-DC circuits;
the voltage reference circuit comprises an ADR02BRZ chip, a CD4052 chip, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a fifth capacitor;
one end of the second resistor is an input end of the voltage reference circuit, the other end of the second resistor is respectively and electrically connected with one end of the fifth capacitor and the VIN port of the ADR02BRZ chip, the other end of the fifth capacitor is respectively and electrically connected with the COM port of the ADR02BRZ chip and one end of the third resistor and grounded, the other end of the third resistor is electrically connected with one end of the fourth resistor, the other end of the fourth resistor is electrically connected with one end of the fifth resistor, the other end of the fifth resistor is respectively and electrically connected with the VOUT port of the ADR02BRZ chip and the input port of the CD4052 chip, and the output end of the CD4052 chip is electrically connected with the conversion output module.
6. The apparatus for supporting multiple channels to output analog signals simultaneously according to claim 2, wherein the conversion output module includes a current source output circuit, a channel switching circuit, a resistance output circuit and an output interface circuit;
the current source output circuit is respectively electrically connected with the voltage reference circuit, the channel switching circuit and the main control module, is controlled by the main control module, and is used for receiving the current output by the voltage reference circuit, realizing V/I cross current conversion, obtaining a current signal and outputting the current signal;
the channel switching circuit is electrically connected with the output interface circuit, is controlled by the main control module, and is used for receiving a current signal of the current source output circuit, selecting different channels to switch and output the current signal to the output interface circuit and then transmitting the current signal to the outside;
the resistance output circuit is respectively electrically connected with the main control module and the output interface circuit, is controlled by the main control module, and is used for outputting resistance signals, selecting different channels to switch and output the resistance signals to the output interface circuit and then transmitting the resistance signals to the outside.
7. The device supporting multi-channel simultaneous output of analog signals according to claim 6, wherein a plurality of current source output circuits are provided, and each current source output circuit comprises an operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a sixth capacitor, a first impedance, a MOS (metal oxide semiconductor) transistor, a fourth diode, a fifth diode, a first photoelectric coupler and a second photoelectric coupler;
the positive phase input end of the operational amplifier is electrically connected with the voltage reference circuit, the negative phase input end of the operational amplifier is respectively electrically connected with the source electrode of the MOS tube and one end of the seventh resistor, the other end of the seventh resistor is grounded, the negative electrode of the operational amplifier is grounded, the output end of the operational amplifier is electrically connected with one end of the sixth resistor, and the other end of the sixth resistor is electrically connected with the drain electrode of the MOS tube;
the positive electrode of the operational amplifier is electrically connected with one end of the sixth capacitor and one end of the first impedance respectively, the other end of the first impedance is electrically connected with one end of the first photoelectric coupler, the other end of the corresponding first photoelectric coupler is the output end of the current source output circuit, the other end of the sixth capacitor is electrically connected with the grid electrode of the MOS tube and the negative electrode of the fourth diode respectively, the positive electrode of the fourth diode is electrically connected with one end of the second photoelectric coupler, and the other end of the corresponding second photoelectric coupler is the other output end of the current source output circuit;
one end of the eighth resistor is electrically connected with a fixed power supply, the other end of the eighth resistor is electrically connected with the control end of the first photoelectric coupler, the other control end of the first photoelectric coupler is electrically connected with the control end of the second photoelectric coupler, and the other control end of the second photoelectric coupler is electrically connected with the main control module.
8. The apparatus for supporting multiple channels to output analog signals simultaneously according to claim 6, wherein a plurality of said channel switching circuits are provided, said channel switching circuits including a switching sub-circuit and a control sub-circuit;
the switching sub-circuit comprises a first switch and a second switch, the first switch is controlled by the control sub-circuit to switch channels, and the second switch is controlled by the control sub-circuit to switch channels;
the control sub-circuit comprises a relay, a fifth diode, a photodiode, an eighth resistor, a ninth resistor, a tenth resistor and a first triode;
one end of the relay is respectively electrically connected with the negative electrode of the fifth diode and the positive electrode of the photodiode, the negative electrode of the photodiode is electrically connected with the eighth resistor, the other end of the relay is respectively electrically connected with the positive electrode of the fifth diode, the other end of the eighth resistor and the collector electrode of the first triode, the base electrode of the first triode is respectively electrically connected with one end of the ninth resistor and one end of the tenth resistor, the other end of the ninth resistor is respectively electrically connected with the main control module, and the other end of the tenth resistor is electrically connected with the emitter electrode of the first triode and grounded.
9. The device supporting multi-channel simultaneous output of analog signals according to claim 6, wherein a plurality of the resistor output circuits are provided, and the resistor output circuits comprise an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third photocoupler and a fourth photocoupler;
one end of the third photoelectric coupler is an input end of the resistor output circuit, the other end of the third photoelectric coupler is electrically connected with one end of the twelfth resistor, and the other end of the twelfth resistor is electrically connected with the output interface circuit;
one end of the fourth photoelectric coupler is an input end of the resistor output circuit, the other end of the fourth photoelectric coupler is electrically connected with one end of the thirteenth resistor, and the other end of the twelfth resistor is electrically connected with the output interface circuit;
one end of the eleventh resistor is electrically connected with a fixed power supply, the other end of the eleventh resistor is electrically connected with the control end of the third photoelectric coupler, the other control end of the third photoelectric coupler is electrically connected with the control end of the fourth photoelectric coupler, and the other control end of the fourth photoelectric coupler is electrically connected with the main control module.
10. The apparatus for supporting multi-channel simultaneous output of analog signals according to claim 1, wherein the main control module comprises a CPU circuit, a key circuit and a logic control circuit;
the CPU circuit is respectively and electrically connected with the key circuit and the logic control circuit, the CPU circuit comprises a CPU and a CPU peripheral circuit, and the CPU circuit is used for controlling the logic control circuit to output a control logic signal to the conversion output module so as to adjust the analog signal output of the conversion output module;
the key circuit is used for inputting a control instruction to the CPU circuit so as to change the output of the logic control circuit;
the logic control circuit is electrically connected with the conversion output module and is used for controlling the output of the conversion output module.
11. The device for supporting multiple channels to output analog signals simultaneously as claimed in claim 10, further comprising a 485 communication circuit, wherein the 485 communication circuit is electrically connected to the CPU circuit, and is used for the CPU in the CPU circuit to communicate with an external upper computer, so as to implement automatic control.
CN202111626782.6A 2021-12-28 2021-12-28 Device supporting multi-channel simultaneous output of analog signals Pending CN115441857A (en)

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CN202111626782.6A CN115441857A (en) 2021-12-28 2021-12-28 Device supporting multi-channel simultaneous output of analog signals

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Application Number Priority Date Filing Date Title
CN202111626782.6A CN115441857A (en) 2021-12-28 2021-12-28 Device supporting multi-channel simultaneous output of analog signals

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