CN218158850U - Switching value output circuit of distribution automation comprehensive tester - Google Patents
Switching value output circuit of distribution automation comprehensive tester Download PDFInfo
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- CN218158850U CN218158850U CN202222860472.7U CN202222860472U CN218158850U CN 218158850 U CN218158850 U CN 218158850U CN 202222860472 U CN202222860472 U CN 202222860472U CN 218158850 U CN218158850 U CN 218158850U
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Abstract
The utility model discloses a switching value output circuit of a distribution automation comprehensive tester, which comprises a first output isolation circuit, a second output isolation circuit, an output filter circuit and an output protection circuit; the first output isolation circuit performs first isolation on the switching value; the second output isolation circuit carries out second isolation on the switching value; the output filter circuit is used for filtering; the output protection circuit is used for protection and outputting a final switching value signal. The utility model discloses a design of two way isolation circuits and filter circuit, protection circuit, not only realized the switching value output of distribution automation comprehensive tester, but also guaranteed circuit electrical isolation and signal filtering; therefore, the utility model discloses a reliability is high, and interference immunity is good and simple and convenient.
Description
Technical Field
The utility model belongs to the electric automatization field, concretely relates to distribution automation integrated test appearance's switching value output circuit.
Background
With the development of economic technology and the improvement of living standard of people, electric energy becomes essential secondary energy in production and life of people, and brings endless convenience to production and life of people. Therefore, ensuring stable and reliable operation of electric energy becomes one of the most important tasks of the power system.
The power distribution terminal needs to be debugged before operation and during maintenance and the like in operation; the appearance of the distribution automation comprehensive tester brings great convenience to the debugging work of the distribution terminal. When the distribution automation comprehensive tester works, a large number of switching value states need to be output, so that a large number of switching value output circuits need to be adopted; at present, the switching value output circuit adopted by the distribution automation comprehensive tester is generally the switching value output circuit disclosed in the patent with the application number of 201721591037.1, that is, the switching value to be output is output through an amplifying circuit composed of a triode, a corresponding resistor and a corresponding capacitor. This output mode is simple and has a certain load capacity, but it causes a problem when it is used in a distribution automation comprehensive tester. The working environment of the distribution automation comprehensive tester is extremely severe, and the electromagnetic interference on site is large; when the existing switching value output circuit is adopted to output the switching value, the electromagnetic interference of the environment is very easy to be connected into the output circuit in series through a very easy connecting wire, thereby causing the error of an output signal and the misoperation of a power transmission circuit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a distribution automation comprehensive tester's switching value output circuit that the reliability is high, interference immunity is good and simple and convenient.
The utility model provides a switching value output circuit of the distribution automation comprehensive tester, which comprises a first output isolation circuit, a second output isolation circuit, an output filter circuit and an output protection circuit; the first output isolation circuit, the second output isolation circuit, the output filter circuit and the output protection circuit are sequentially connected in series; the output pin of the controller is connected with the input end of the first output isolation circuit; the output end of the output protection circuit is a switching value output end; the first output isolation circuit is used for carrying out first isolation on the switching value output by the controller and outputting the isolated switching value signal to the second output isolation circuit; the second output isolation circuit is used for carrying out second isolation on the switching value output by the controller and outputting the isolated switching value signal to the output filter circuit; the output filter circuit is used for filtering the isolated switching value output signal and outputting the filtered switching value signal to the output protection circuit; the output protection circuit is used for carrying out output protection on the filtered and isolated switching value output signal and outputting the switching value signal which is finally subjected to protection, filtering and isolation.
The first output isolation circuit comprises an isolation optocoupler, a current-limiting resistor and a filter capacitor; the positive electrode of the input end of the isolation optocoupler is connected with a power supply end through a current-limiting resistor which is connected in series, and the negative electrode of the input end of the isolation optocoupler is connected with an output pin of the controller; the positive electrode of the output end of the isolation optocoupler is the output end of the first output isolation circuit, and the negative electrode of the output end of the isolation optocoupler is grounded; the filter capacitor is connected in parallel between the anode of the output end of the isolation optocoupler and the cathode of the output end of the isolation optocoupler and used for filtering an output signal of the isolation optocoupler.
The second output isolation circuit comprises an isolation relay and a one-way protection diode; the positive pole of the control end of the isolation relay is connected with a power supply signal, and the negative pole of the control end of the isolation relay is connected with the output end of the first output isolation circuit; a unidirectional protection diode is connected between the anode of the control end of the isolation relay and the cathode of the control end of the isolation relay in parallel, and the cathode of the unidirectional protection diode is connected with a power supply signal; after the first common end and the second common end of the contact end of the isolation relay are in short circuit, the first common end and the second common end are used as one end of the output end of the second output isolation circuit; and after the active end of the first normally-open node of the contact end of the isolation relay is in short circuit with the active end of the second normally-open node, the active end of the first normally-open node is used as the other end of the output end of the second output isolation circuit.
The output filter circuit comprises an output first filter capacitor, an output second filter capacitor, an output first filter inductor and an output second filter inductor; one end of the output end of the second output isolation circuit is connected in series with the first filter inductor and then serves as one end of the output filter circuit; the other end of the output end of the second output isolation circuit is connected in series with a second filter inductor and then serves as the other end of the output filter circuit; the output first filter inductor and the output second filter inductor are used for filtering line signals; the output first filter capacitor and the output second filter capacitor are connected in parallel between the output ends of the second output isolation circuit and used for filtering.
The output protection circuit comprises a TVS tube; two ends of the TVS tube are the output ends of the final output protection circuit; two ends of the TVS tube are connected in parallel between the output ends of the output filter circuit and used for protecting the two output ends of the output protection circuit.
The utility model provides a switching value output circuit of the distribution automation comprehensive tester, through the design of two ways of isolation circuits, filter circuits and protection circuits, not only realizes the switching value output of the distribution automation comprehensive tester, but also ensures the circuit electrical isolation and signal filtering; therefore, the utility model discloses a reliability is high, and interference immunity is good and simple and convenient.
Drawings
Fig. 1 is a schematic diagram of the functional modules of the present invention.
Fig. 2 is a schematic diagram of the circuit principle of the present invention.
Detailed Description
Fig. 1 shows a schematic diagram of the functional modules of the present invention: the utility model provides a switching value output circuit of the distribution automation comprehensive tester, which comprises a first output isolation circuit, a second output isolation circuit, an output filter circuit and an output protection circuit; the first output isolation circuit, the second output isolation circuit, the output filter circuit and the output protection circuit are sequentially connected in series; an output pin of the controller is connected with the input end of the first output isolation circuit; the output end of the output protection circuit is a switching value output end; the first output isolation circuit is used for carrying out first isolation on the switching value output by the controller and outputting the isolated switching value signal to the second output isolation circuit; the second output isolation circuit is used for carrying out second isolation on the switching value output by the controller and outputting the isolated switching value signal to the output filter circuit; the output filter circuit is used for filtering the isolated switching value output signal and outputting the filtered switching value signal to the output protection circuit; the output protection circuit is used for carrying out output protection on the filtered and isolated switching value output signals and outputting the finally protected, filtered and isolated switching value signals.
Fig. 2 shows a schematic diagram of the circuit principle of the present invention: in specific implementation, the first output isolation circuit comprises an isolation optocoupler U1, a current limiting resistor R1 and a filter capacitor C1; the positive pole (pin 1) of the input end of the isolation optocoupler is connected with a power supply end VCC through a current limiting resistor which is connected in series, and the negative pole (pin 2) of the input end of the isolation optocoupler is connected with an output pin of a controller (a microprocessor in the figure); the positive pole (pin 4) of the output end of the isolation optocoupler is the output end of the first output isolation circuit, and the negative pole (pin 3) of the output end of the isolation optocoupler is grounded; and the filter capacitor is connected in parallel between the output end anode and the output end cathode of the isolation optocoupler and used for filtering an output signal of the isolation optocoupler.
The second output isolation circuit comprises an isolation relay RL1 and a one-way protection diode D1; the positive pole (pin 1) of the control end of the isolation relay is connected with a power supply signal VDD, and the negative pole (pin 8) of the control end of the isolation relay is connected with the output end of the first output isolation circuit; a unidirectional protection diode is connected in parallel between the anode of the control end of the isolation relay and the cathode of the control end of the isolation relay, and the cathode of the unidirectional protection diode is connected with a power signal; the contact end of the relay shown in the figure comprises 6 pins, namely 2 pins, 3 pins, 4 pins, 5 pins, 6 pins and 7 pins, wherein the 2 pins and the 3 pins are a first pair of normally closed pins, the 3 pins and the 4 pins are a first pair of normally open pins, the 7 pins and the 6 pins are a second pair of normally closed pins, and the 6 pins and the 5 pins are a second pair of normally open pins; if the control end (between the pin 1 and the pin 8) of the relay is not electrified, the pin 2 and the pin 3 are closed, the pin 3 and the pin 4 are opened, the pin 6 and the pin 7 are closed, and the pin 6 and the pin 5 are opened; if the control end (between the pin 1 and the pin 8) of the relay is electrified, the pin 2 and the pin 3 are disconnected, the pin 3 and the pin 4 are closed, the pin 7 and the pin 6 are disconnected, and the pin 6 and the pin 5 are closed; therefore, in the present invention, 3 pins are referred to as the first common end of the relay contact end, 6 pins are referred to as the second common end of the relay contact end, 4 pins are referred to as the movable end of the first normally open node of the relay contact end, and 5 pins are referred to as the movable end of the second normally open node of the relay contact end; after a pin 3 of the first public end and a pin 6 of the second public end of the contact end of the isolation relay are in short circuit, the first public end is used as one end of the output end of the second output isolation circuit; and after the movable end pin 4 of the first normally-open node of the contact end of the isolation relay is in short circuit with the movable end pin 5 of the second normally-open node, the contact end of the isolation relay is used as the other end of the output end of the second output isolation circuit.
The output filter circuit comprises an output first filter capacitor C2, an output second filter capacitor E1 (the capacitor E1 is a Y capacitor), an output first filter inductor L1 and an output second filter inductor L2; one end of the output end of the second output isolation circuit is connected in series with the first filter inductor and then serves as one end of the output filter circuit; the other end of the output end of the second output isolation circuit is connected in series with a second filter inductor and then serves as the other end of the output filter circuit; the output first filter inductor and the output second filter inductor are used for filtering line signals; the output first filter capacitor and the output second filter capacitor are connected in parallel between the output ends of the second output isolation circuit and used for filtering.
The output protection circuit comprises a TVS tube (denoted TVS in the figure); two ends of the TVS tube are the output ends of the final output protection circuit; two ends of the TVS tube are connected in parallel between the output ends of the output filter circuit and used for protecting the two output ends of the output protection circuit.
The utility model discloses the working process of circuit as follows:
when the microprocessor outputs a high level, the input end of the isolation optocoupler U1 is not electrified, and the output end of the isolation optocoupler U1 is disconnected; at this time, the control end of the RL1 of the isolation relay is not electrified, and the circuit state of the contact end of the RL1 of the isolation relay is shown in fig. 1; at the moment, the connecting terminal A is connected with the pins 3 and 6 of the isolation relay after being filtered by the inductor L1, the connecting terminal B is connected with the pins 4 and 5 of the isolation relay after being filtered by the inductor L2, and the connecting terminal A and the connecting terminal B are not connected;
when the microprocessor outputs a low level, the input end of the isolation optocoupler U1 is electrified, and the output end of the isolation optocoupler U1 is closed; at this time, the control end of the RL1 of the isolation relay is electrified, and at this time, the circuit state of the contact end of the RL1 of the isolation relay changes to: the pin 2 is disconnected with the pin 3, the pin 3 is connected with the pin 4, the pin 7 is disconnected with the pin 6, and the pin 6 is connected with the pin 5; at the moment, the wiring terminal A is connected with the pins 3 and 6 of the isolation relay after being filtered by the inductor L1, the wiring terminal B is connected with the pins 4 and 5 of the isolation relay after being filtered by the inductor L2, and the wiring terminal A is connected with the wiring terminal B.
Through the working process of the circuit, the microprocessor outputs a switching value, so that the wiring terminal A and the wiring terminal B are connected and disconnected once.
The circuit provided by the utility model realizes the isolated output of the switching value output by the microprocessor (controller) through the isolation optocoupler and the isolation relay, realizes the filtering of signals through the inductance and the capacitance, and realizes the protection of the signals through the TVS tube; and the isolating relay also ensures that the circuit has certain load capacity. Therefore, the anti-interference capability of the circuit is strong, and the malfunction of the circuit can be prevented under the electromagnetic environment; and the circuit device is also a common device, so the circuit is relatively simple, reliable and convenient.
Claims (5)
1. A switching value output circuit of a distribution automation comprehensive tester is characterized by comprising a first output isolation circuit, a second output isolation circuit, an output filter circuit and an output protection circuit; the first output isolation circuit, the second output isolation circuit, the output filter circuit and the output protection circuit are sequentially connected in series; an output pin of the controller is connected with the input end of the first output isolation circuit; the output end of the output protection circuit is a switching value output end; the first output isolation circuit is used for carrying out first isolation on the switching value output by the controller and outputting the isolated switching value signal to the second output isolation circuit; the second output isolation circuit is used for carrying out second isolation on the switching value output by the controller and outputting the isolated switching value signal to the output filter circuit; the output filter circuit is used for filtering the isolated switching value output signal and outputting the filtered switching value signal to the output protection circuit; the output protection circuit is used for carrying out output protection on the filtered and isolated switching value output signal and outputting the switching value signal which is finally subjected to protection, filtering and isolation.
2. The switching value output circuit of the distribution automation comprehensive tester as claimed in claim 1, wherein the first output isolation circuit comprises an isolation optocoupler, a current limiting resistor and a filter capacitor; the positive electrode of the input end of the isolation optocoupler is connected with a power supply end through a current-limiting resistor which is connected in series, and the negative electrode of the input end of the isolation optocoupler is connected with an output pin of the controller; the positive electrode of the output end of the isolation optocoupler is the output end of the first output isolation circuit, and the negative electrode of the output end of the isolation optocoupler is grounded; the filter capacitor is connected in parallel between the anode of the output end of the isolation optocoupler and the cathode of the output end of the isolation optocoupler and used for filtering an output signal of the isolation optocoupler.
3. The switching value output circuit of the distribution automation integrated tester as claimed in claim 2, wherein the second output isolation circuit includes an isolation relay and a one-way protection diode; the positive pole of the control end of the isolation relay is connected with a power supply signal, and the negative pole of the control end of the isolation relay is connected with the output end of the first output isolation circuit; a unidirectional protection diode is connected between the anode of the control end of the isolation relay and the cathode of the control end of the isolation relay in parallel, and the cathode of the unidirectional protection diode is connected with a power supply signal; after the first common end and the second common end of the contact end of the isolation relay are in short circuit, the first common end and the second common end are used as one end of the output end of the second output isolation circuit; and after the active end of the first normally open node and the active end of the second normally open node at the contact end of the isolation relay are in short circuit, the active ends are used as the other end of the output end of the second output isolation circuit.
4. The switching value output circuit of the distribution automation comprehensive tester as claimed in claim 3, wherein the output filter circuit comprises an output first filter capacitor, an output second filter capacitor, an output first filter inductor and an output second filter inductor; one end of the output end of the second output isolation circuit is connected in series with the first filter inductor and then serves as one end of the output filter circuit; the other end of the output end of the second output isolation circuit is connected in series with a second filter inductor and then serves as the other end of the output filter circuit; the output first filter inductor and the output second filter inductor are used for filtering line signals; the output first filter capacitor and the output second filter capacitor are connected in parallel between the output ends of the second output isolation circuit and used for filtering.
5. The switching value output circuit of the distribution automation comprehensive tester as claimed in claim 4, wherein the output protection circuit comprises a TVS tube; two ends of the TVS tube are the output ends of the final output protection circuit; two ends of the TVS tube are connected in parallel between the output ends of the output filter circuit and used for protecting the two output ends of the output protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222860472.7U CN218158850U (en) | 2022-10-28 | 2022-10-28 | Switching value output circuit of distribution automation comprehensive tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222860472.7U CN218158850U (en) | 2022-10-28 | 2022-10-28 | Switching value output circuit of distribution automation comprehensive tester |
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| Publication Number | Publication Date |
|---|---|
| CN218158850U true CN218158850U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222860472.7U Active CN218158850U (en) | 2022-10-28 | 2022-10-28 | Switching value output circuit of distribution automation comprehensive tester |
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| Country | Link |
|---|---|
| CN (1) | CN218158850U (en) |
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- 2022-10-28 CN CN202222860472.7U patent/CN218158850U/en active Active
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