CN109188989B - Open-in acquisition 110V220V self-adaptive system - Google Patents
Open-in acquisition 110V220V self-adaptive system Download PDFInfo
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- CN109188989B CN109188989B CN201811319224.3A CN201811319224A CN109188989B CN 109188989 B CN109188989 B CN 109188989B CN 201811319224 A CN201811319224 A CN 201811319224A CN 109188989 B CN109188989 B CN 109188989B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21127—Signal adaption I-O
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Abstract
The invention discloses an open-in acquisition 110V220V self-adaptive system, which belongs to the field of power system automation and comprises a signal input, a comparator, a photoelectric isolation, a digital circuit and a voltage reference; the signal input comprises a switching value signal conditioning circuit, the negative end of the comparator is connected with the signal input, the positive end of the comparator is connected with a voltage reference, the output of the comparator is connected with a cathode of the photoelectric isolation, the photoelectric isolation comprises a photoelectric isolation chip, and the output signal of the photoelectric isolation chip is connected with a digital circuit; the voltage reference comprises a photoelectric isolation chip, a voltage regulator tube and an isolation power supply, the cathode is connected with a control signal of the digital circuit, and the control signal is stored in the power-on nonvolatile storage area EEPROM; the output signal of the photoelectric isolation chip is connected with the anode of the voltage regulator tube; the cathode of the voltage-stabilizing tube is connected with 5V; the isolation power supply comprises an input end and an output end, and the output end is 5V and KM-. The invention can realize the self-adaptive acquisition and detection of the switching values of 110V and 220V, and is convenient for acquiring the switching value signals.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a protection control and automation device requiring switching value input acquisition in substation automation and industrial control automation, and particularly relates to a 110V-220V open-acquisition self-adaptive system.
Background
Before the acquisition of the switching value input signal of the transformer substation integrated automation system, a photoelectric isolation chip is generally adopted to realize photoelectric isolation processing, and the direct current level of the switching value signal input is judged through the digital level 0 or 1 output by the photoelectric isolation chip. In industrial control occasions such as a transformer substation and the like, the requirements of the open-in direct-current voltage grades are different, and the general situation is divided into direct-current DC110V and direct-current DC220V, so open-in acquisition board cards with different voltage grades often need to be configured, if the open-in acquisition board cards with low voltage grades are mistakenly connected into high voltage, the board cards are burnt out, and the maintenance is very inconvenient.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a can realize opening into gathering 110V220V self-adaptation system, can solve on the basis of not changing the acquisition integrated circuit board of opening into, automatic acquisition and detection open into signal.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
an open-acquisition 110V220V adaptive system, at least comprising: signal input, comparators, optoelectronic isolation, digital circuitry and voltage references; wherein:
the signal input is to connect the switching value inputs with different voltage grades to the negative end of the comparator after the voltage division by the resistor; the positive end of the comparator is connected with a reference voltage KIREF, when the positive end of the comparator is larger than the negative end, the comparator outputs a high level 1, when the negative end of the comparator is larger than the positive end, the comparator outputs a low level 0, and the output end of the comparator is connected with the photoelectric isolated input; the photoelectric isolation uses a photoelectric isolation chip to convert an electric signal into an optical signal, and then converts the optical signal into the electric signal to realize isolation, the input end of the photoelectric isolation chip adopts a current-limiting resistor, and the output end of the photoelectric isolation chip is connected to a digital circuit CPU; the digital circuit CPU writes a preset open input voltage level into an EEPROM (electrically non-volatile memory area), reads an open level state 0 or 1 from the EEPROM, and controls the output of a reference voltage KIREF to be DC2.5V or DC 5V; the voltage value of a reference voltage KIREF of the voltage reference is determined by a control signal KIPWRWH, the KIPWRWH is set by a digital circuit configuration unit, and when an on-signal is 110V, the control signal KIPWRWH is set to be at a low level; when the on-signal is 220V, the control signal KIPWRWH is set to a high level, and when the control signal KIPWRWH is a low level, the reference voltage KIREF is DC2.5V; when the control signal KIPWRWH is high, the reference voltage KIREF is DC5V, wherein: DC5V is generated by the power isolation module.
Further: the signal input comprises a switching value signal conditioning circuit, and a switching value input signal is connected to the negative end of the comparator after being divided by the first voltage dividing resistor and the second voltage dividing resistor.
Further: the positive end of the comparator is connected with a voltage reference through a third resistor, the output end of the comparator is connected with the photoelectric isolated cathode, and the positive end of the comparator is connected with the output end of the comparator through a fourth resistor; the third resistor, the fourth resistor and the comparator form a hysteresis comparison circuit.
Further: the voltage reference comprises a photoelectric isolation chip, a voltage regulator tube and an isolation power supply, wherein: the anode of the photoelectric isolation chip is connected with +5V, the cathode of the photoelectric isolation chip is connected with a control signal KIPWRWH of the digital circuit, and an output signal of the photoelectric isolation chip is connected with the anode of the voltage regulator tube; the cathode of the voltage-stabilizing tube is a reference voltage reference KIREF, and the cathode of the voltage-stabilizing tube is connected with a 5V power supply through a resistor.
Further: the isolation power supply comprises a power isolation module P1, input signals of 5V and GND, and output signals of 5V and KM-.
Further: the photoelectric isolation comprises a photoelectric isolation chip, the anode of the photoelectric isolation chip is connected with a 5V power supply, and the output end of the photoelectric isolation chip is connected with a CPU.
The invention has the advantages and positive effects that:
by adopting the technical scheme, the invention can meet the requirement of acquiring the input signals of different rated working voltage grades without replacing the input acquisition board card, so that the field operation is simpler, the board card cannot be burnt out through misoperation, and the operation safety is improved. Meanwhile, a hysteresis comparison circuit is adopted, so that a certain filtering effect is achieved on the fluctuation of an input signal, and the purpose of hardware jitter elimination is achieved. Because the input current of the comparator is very small, the resistances of the first divider resistor R1 and the second divider resistor R2 for voltage division can be selected to be larger, the direct current power consumption is effectively reduced, the heat generation on the first divider resistor R1 and the second divider resistor R2 is reduced, and the temperature rise of the control device is controlled.
Drawings
FIG. 1 is a block circuit diagram of the present invention;
FIG. 2 is a partial circuit diagram of the present invention, which is mainly used to show the connection relationship of signal inputs;
FIG. 3 is a partial circuit diagram of the present invention, which is mainly used to show the connection relationship of the comparator;
FIG. 4 is a partial circuit diagram of the present invention, primarily for showing the connection relationship of the photo-isolation;
FIG. 5 is a partial circuit diagram of the present invention, which is mainly used to show the connection relationship of voltage references;
FIG. 6 is a partial circuit diagram of the present invention, which is mainly used to show the connection relationship of the isolated power sources;
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1 to 6, an open-acquisition 110V220V adaptive system includes: signal input, comparator, photoelectric isolation, digital circuit, voltage reference.
The signal input is to connect the switching value inputs with different voltage grades to the negative end of the comparator after the voltage division by the resistor; the comparator is a voltage comparator, the positive end of the comparator is connected with reference voltage, when the positive end of the comparator is larger than the negative end, the comparator outputs a high level 1, when the negative end of the comparator is larger than the positive end, the comparator outputs a low level 0, and the output of the comparator is connected with the input of the photoelectric isolation; the photoelectric isolation uses a photoelectric isolation chip to convert an electric signal into an optical signal, and then converts the optical signal into an electric signal to realize isolation, the input end adopts a current-limiting resistor, and the output end of the photoelectric isolation chip is connected to a CPU; the CPU writes a preset open input voltage level into an EEPROM (electrically non-volatile memory), reads an open level state 0 or 1 from the EEPROM, and controls the output of a reference voltage KIREF to be DC2.5V or DC 5V; the voltage reference, the voltage value of the reference voltage KIREF is determined by a control signal KIPWRWH, the KIPWRWH is set by a CPU configuration unit, and when the input signal is 110V, the KIPWRWH is set to be in a low level; when the on signal is 220V, KIPWRWH sets high. When KIPWRWH is low, the reference voltage KIREF is DC2.5V; when KIPWRWH is high, the reference voltage KIREF is DC5V, where DC5V is generated by the power isolation module.
Fig. 2 to 6 are circuit diagrams of parts of the above preferred embodiment:
referring to fig. 2, the signal input circuit includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2 connected in sequence, where KM-is a reference ground, and the input signal KI1 passes through the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and then outputs a signal KI1_ 1. Because the input current of the comparator is very small, the resistances of the first divider resistor R1 and the second divider resistor R2 are selected to be larger, and the direct-current power consumption is effectively reduced. The open operation voltage may be set according to the values of the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and may be set to a voltage of 55% to 70% of the rated voltage.
Referring to fig. 3, the comparator includes a voltage comparator, a feedback third resistor R3 and a feedback fourth resistor R4, and a pull-up resistor R5 connected in sequence. The negative terminal of the No. 2 pin of the voltage comparator is connected with KI1_1, the positive terminal of the No. 3 pin is connected with KIREF, the output terminal of the No. 1 pin is connected with an output signal KI1_2, and the output signal KI is connected to 5V through a pull-up resistor R5. The third resistor R3 and the fourth resistor R4 enable the comparison circuit to have a hysteresis comparison function, and the open-circuit return voltage can be configured to be a desired value by adjusting the resistance values of the third resistor R3 and the fourth resistor R4, for example, the open-circuit return voltage can be configured to be below a rated voltage of 55%.
Referring to fig. 4, the optoelectronic isolator includes an optoelectronic isolator chip U2, a current limiting resistor R6, a pull-up resistor R7, a pin 1 of the optoelectronic isolator chip U2 connected to 5V, a pin 2 connected to KI1_2, a pin 3 connected to GND, and a pin 4 connected to an output signal DI 1.
Referring to fig. 5, the voltage reference includes a photo-isolation chip U3, a voltage regulator tube D1, a current limiting resistor R8, and a series resistor R9 connected in sequence, wherein the pin 1 of the photo-isolation chip is connected to 5V, the pin 2 is connected to KIPWRWH, the pin 3 is connected to KM-, the pin 4 is connected to the anode of the voltage regulator tube D1, and the pin 5V is connected to the pins 2 and 3 of D1 through a series resistor R9 as the output KIREF of the reference voltage.
Referring to fig. 6, the isolation power supply includes a P1 isolation power supply module, a pin 1 of P1 is connected to 5V, a pin 2 is connected to GND, a pin 3 is connected to KM-, and a pin 4 is connected to 5V, so as to implement power supply isolation between the signal input circuit and the CPU.
The CPU writes a preset input voltage level into an electrically-powered nonvolatile storage area EEPROM, when an input signal is 110V, KIPWRWH is set to be low level, a photoelectric isolation chip U3 is conducted, a reference voltage KIREF is DC2.5V, a KI1_1 signal is larger than DC2.5V, KI1_2 is output to be low level 0, the photoelectric isolation chip U2 is conducted, DI1 is output to be low level 0 to the CPU, when a KI1_1 signal is smaller than DC2.5V, KI1_2 is output to be high level 1, the photoelectric isolation chip U2 is cut off, and DI1 is output to be high level 1 to the CPU; when the input signal is 220V, the KIPWRWH is set to be at a high level, the optoelectronic isolation chip U3 is turned off, the reference voltage KIREF is DC5V, the KI1_1 signal is greater than DC5V, the KI1_2 output is at a low level 0, the optoelectronic isolation chip U2 is turned on, the DI1 output is from the low level 0 to the CPU, when the KI1_1 signal is less than DC5V, the KI1_2 output is at a high level 1, the optoelectronic isolation chip U2 is turned off, and the DI1 output is at a high level 1 to the CPU.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (6)
1. An open-access acquisition 110V220V adaptive system, characterized in that: at least comprises the following steps: signal input, comparators, optoelectronic isolation, digital circuitry and voltage references; wherein:
the signal input is to connect the switching value inputs with different voltage grades to the negative end of the comparator after the voltage division by the resistor; the positive end of the comparator is connected with a reference voltage KIREF, when the positive end of the comparator is larger than the negative end, the comparator outputs a high level 1, when the negative end of the comparator is larger than the positive end, the comparator outputs a low level 0, and the output end of the comparator is connected with the photoelectric isolated input; the photoelectric isolation uses a photoelectric isolation chip to convert an electric signal into an optical signal, and then converts the optical signal into the electric signal to realize isolation, the input end of the photoelectric isolation chip adopts a current-limiting resistor, and the output end of the photoelectric isolation chip is connected to a digital circuit CPU; the digital circuit CPU writes a preset open input voltage level into an EEPROM (electrically non-volatile memory area), reads an open level state 0 or 1 from the EEPROM, and controls the output of a reference voltage KIREF to be DC2.5V or DC 5V; the voltage value of a reference voltage KIREF of the voltage reference is determined by a control signal KIPWRWH, the KIPWRWH is set by a digital circuit configuration unit, and when an on-signal is 110V, the control signal KIPWRWH is set to be at a low level; when the on-signal is 220V, the control signal KIPWRWH is set to a high level, and when the control signal KIPWRWH is a low level, the reference voltage KIREF is DC2.5V; when the control signal KIPWRWH is high, the reference voltage KIREF is DC5V, wherein: DC5V is generated by the power isolation module.
2. The open-access acquisition 110V220V adaptive system according to claim 1, characterized in that: the signal input comprises a switching value signal conditioning circuit, and a switching value input signal is connected to the negative end of the comparator after being divided by the first voltage dividing resistor and the second voltage dividing resistor.
3. The open-access acquisition 110V220V adaptive system according to claim 1, characterized in that: the positive end of the comparator is connected with a voltage reference through a third resistor, the output end of the comparator is connected with the photoelectric isolated cathode, and the positive end of the comparator is connected with the output end of the comparator through a fourth resistor; the third resistor, the fourth resistor and the comparator form a hysteresis comparison circuit.
4. The open-access acquisition 110V220V adaptive system according to claim 1, characterized in that: the voltage reference comprises a photoelectric isolation chip, a voltage regulator tube and an isolation power supply, wherein: the anode of the photoelectric isolation chip is connected with +5V, the cathode of the photoelectric isolation chip is connected with a control signal KIPWRWH of the CPU, and an output signal of the photoelectric isolation chip is connected with the anode of the voltage regulator tube; the cathode of the voltage-stabilizing tube is a reference voltage reference KIREF, and the cathode of the voltage-stabilizing tube is connected with a 5V power supply through a resistor.
5. The drive-in acquisition 110V220V adaptive system of claim 4, wherein: the isolation power supply comprises a power isolation module P1, input signals of 5V and GND, and output signals of 5V and KM-.
6. The open-access acquisition 110V220V adaptive system according to claim 1, characterized in that: the photoelectric isolation comprises a photoelectric isolation chip, the anode of the photoelectric isolation chip is connected with a 5V power supply, and the output end of the photoelectric isolation chip is connected with a CPU.
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| CN201811319224.3A CN109188989B (en) | 2018-11-07 | 2018-11-07 | Open-in acquisition 110V220V self-adaptive system |
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| CN201811319224.3A CN109188989B (en) | 2018-11-07 | 2018-11-07 | Open-in acquisition 110V220V self-adaptive system |
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| CN109188989A CN109188989A (en) | 2019-01-11 |
| CN109188989B true CN109188989B (en) | 2021-06-01 |
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| US4717839A (en) * | 1987-01-02 | 1988-01-05 | Motorola, Inc. | Transistor comparator circuit having split collector feedback hysteresis |
| CN201974508U (en) * | 2010-12-30 | 2011-09-14 | 上海申瑞电力科技股份有限公司 | AC/DC self-adaptive switch quantity acquisition circuit |
| CN104993829A (en) * | 2015-07-15 | 2015-10-21 | 株洲南车时代电气股份有限公司 | Switching value input acquisition circuit suitable for wide-range level |
| CN106647245A (en) * | 2016-11-29 | 2017-05-10 | 国电南瑞科技股份有限公司 | Self-adaption on-off input circuit of electric power secondary equipment |
| CN108508801A (en) * | 2018-03-30 | 2018-09-07 | 山东泰开电力电子有限公司 | A kind of the intake Acquisition Circuit and method of adaptive remote signalling power supply |
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2018
- 2018-11-07 CN CN201811319224.3A patent/CN109188989B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4717839A (en) * | 1987-01-02 | 1988-01-05 | Motorola, Inc. | Transistor comparator circuit having split collector feedback hysteresis |
| CN201974508U (en) * | 2010-12-30 | 2011-09-14 | 上海申瑞电力科技股份有限公司 | AC/DC self-adaptive switch quantity acquisition circuit |
| CN104993829A (en) * | 2015-07-15 | 2015-10-21 | 株洲南车时代电气股份有限公司 | Switching value input acquisition circuit suitable for wide-range level |
| CN106647245A (en) * | 2016-11-29 | 2017-05-10 | 国电南瑞科技股份有限公司 | Self-adaption on-off input circuit of electric power secondary equipment |
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Address after: No. 369, Central West Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Patentee after: Qingneng Huakong Technology Co.,Ltd. Address before: No. 369, Central West Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Patentee before: UNISM&C CO.,LTD. |