CN212845680U - Direct current switching value detection circuit with electrical protection function - Google Patents
Direct current switching value detection circuit with electrical protection function Download PDFInfo
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- CN212845680U CN212845680U CN202021916377.9U CN202021916377U CN212845680U CN 212845680 U CN212845680 U CN 212845680U CN 202021916377 U CN202021916377 U CN 202021916377U CN 212845680 U CN212845680 U CN 212845680U
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- protection function
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Abstract
The utility model discloses a direct current switching value detection circuitry with electrical protection function, including photoelectric coupler N1, photoelectric coupler N1's first input is connected with DC power supply VCC1 through resistance R1, and DC power supply VCC1 still is connected with digit through two-way electrostatic protection diode D1; the second input end of the photoelectric coupler N1 is connected with one end of the thermistor PTC1 through a fuse F1, the other end of the thermistor PTC1 is connected with one end of a connecting terminal J1, the other end of the connecting terminal J1 is connected with the digital ground, the second input end of the photoelectric coupler N1 is also connected with the digital ground through a piezoresistor RV1, and the connecting part of the fuse F1 and the thermistor PTC1 is connected with the digital ground through a bidirectional electrostatic protection diode D2. The utility model discloses possess fine resistance EMC interference's ability, also have the ability that prevents to exchange 220V and damage, have multiple electrical protection function.
Description
Technical Field
The utility model relates to a direct current switching value detection circuitry with electrical protection function belongs to instrument and terminal equipment switch and detects technical field.
Background
The switch detection circuit is often used in some instruments and terminal equipment, and comprises a switch detection circuit with two modes of external power supply and internal power supply.
The switching value detection of internal power supply generally provides a direct-current power supply from inside, so that the field use is greatly facilitated, the detection can be realized only by adding one switch from outside, and the use is wide. However, this circuit has some hidden troubles that the switching value lead wires are long and are interfered by static electricity and surge. Particularly, the alternating current 220V can be accessed by mistake to cause circuit damage, so that the design which is required to bring convenience to field detection becomes a weak link of the instrument and the terminal equipment, and the condition of factory return and maintenance often occurs.
Therefore, how to design a direct current switch quantity detection device with high reliability, electrical protection function, low circuit cost and convenient realization is a problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming current magnetic latching relay, special control chip removes to send corresponding control command and accomplishes control, the higher problem of cost. The utility model discloses a magnetic latching relay control circuit based on analog signal triggers, pure analog signal trigger control, the reliability is high, and the circuit is simple, realizes easily that the magnetic latching relay of being convenient for is widely used in instrument and meter, has good application prospect.
In order to achieve the purpose, the invention adopts the technical scheme that:
a DC switch value detection circuit with electric protection function comprises a photoelectric coupler N1,
a first input end of the photoelectric coupler N1 is connected with a direct current power supply VCC1 through a resistor R1, and the direct current power supply VCC1 is also connected with a digital ground through a bidirectional electrostatic protection diode D1;
a second input end of the photoelectric coupler N1 is connected with one end of a thermistor PTC1 through a fuse F1, the other end of the thermistor PTC1 is connected with one end of a connecting terminal J1, the other end of the connecting terminal J1 is connected with the digital ground, a second input end of the photoelectric coupler N1 is further connected with the digital ground through a piezoresistor RV1, and the connection part of the fuse F1 and the thermistor PTC1 is connected with the digital ground through a bidirectional electrostatic protection diode D2;
the first output end of the photoelectric coupler N1 is connected with a direct-current power supply VCC2 through a resistor R2, the first human output end of the photoelectric coupler N1 is connected with a simulation ground, a capacitor C1 is connected between the first output end and the second output end of the photoelectric coupler N1 in parallel, the first output end of the photoelectric coupler N1 is further connected with the negative electrode of an anti-static diode ESD1, and the second output end of the photoelectric coupler N1 is further connected with the positive electrode of an anti-static diode ESD 1.
In the aforementioned direct current switching value detection circuit with an electrical protection function, the model of the photocoupler N1 is EL 817.
In the aforementioned direct current switching value detection circuit with the electrical protection function, the voltage of the direct current power supply VCC1 is 24V, and the voltage of the direct current power supply VCC2 is 3.3V.
In the aforementioned dc switching value detection circuit with electrical protection function, the fuse F1 is a self-recovery fuse.
In the direct current switching value detection circuit with the electrical protection function, the type of the thermistor PTC1 is MZ11-06A300-600 rm.
In the aforementioned dc switching value detection circuit with electrical protection function, the model of the anti-static diode ESD1 is PESD3V3S2 UT.
The utility model has the advantages that: the utility model discloses a direct current switching value detection circuitry with electrical protection function for instrument or terminal equipment's inside DC supply's switching value detects, possess fine resistance EMC interference's ability, also have the ability that prevents to exchange 220V and damage, let the circuit have fine stability, reduce the rate of damage at scene, multiple electrical protection function has, the circuit is simple, realize easily, and low cost, can be in instrument or terminal equipment's wide application, good application prospect has.
Drawings
Fig. 1 is a circuit diagram of a dc switching value detection circuit with an electrical protection function according to the present invention.
Detailed Description
The present invention will be further explained with reference to the attached drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the dc switching value detecting circuit with electrical protection function of the present invention includes a photocoupler N1,
a first input end of the photoelectric coupler N1 is connected with a direct current power supply VCC1 through a resistor R1, and the direct current power supply VCC1 is also connected with a digital ground through a bidirectional electrostatic protection diode D1;
a second input end of the photoelectric coupler N1 is connected with one end of a thermistor PTC1 through a fuse F1, the other end of the thermistor PTC1 is connected with one end of a connecting terminal J1, the other end of the connecting terminal J1 is connected with the digital ground, a second input end of the photoelectric coupler N1 is further connected with the digital ground through a piezoresistor RV1, and the connection part of the fuse F1 and the thermistor PTC1 is connected with the digital ground through a bidirectional electrostatic protection diode D2;
the first output end of the photoelectric coupler N1 is connected with a direct-current power supply VCC2 through a resistor R2, the first human output end of the photoelectric coupler N1 is connected with a simulation ground, a capacitor C1 is connected between the first output end and the second output end of the photoelectric coupler N1 in parallel, the first output end of the photoelectric coupler N1 is further connected with the negative electrode of an anti-static diode ESD1, and the second output end of the photoelectric coupler N1 is further connected with the positive electrode of an anti-static diode ESD 1.
The model of the photoelectric coupler N1 is EL817, and the effect of level isolation is started, so that the stability and the reliability of the whole circuit are improved.
The voltage of DC power supply VCC1 provides operating voltage for optoelectronic coupler N1 for 24V, can use instrument or terminal equipment's inside direct current supply, the voltage of DC power supply VCC2 provides operating voltage for preventing static diode ESD1 for 3.3V.
The fuse F1 is a self-recovery fuse, can play a role of a fuse under the condition of low current, supplements the detection of the thermistor PTC1 and improves the reliability of a circuit.
The thermistor PTC1 is MZ11-06A300-600rm in model, high in sensitivity, and can be matched with the bidirectional electrostatic protection diode D2 to prevent the damage caused by the wrong insertion of alternating current 220V, namely the wrong connection of the connection terminal J1.
The model of the anti-static diode ESD1 is PESD3V3S2UT, and the anti-static diode ESD can be placed on the edge of a pin of a control chip, so that the electrostatic damage caused in the welding production process can be reduced.
The utility model discloses a direct current switching value detection circuitry with electrical protection function, the lectotype of electronic components such as specific resistance, electric capacity is shown in FIG. 1, and through experimental verification, can realize direct current switching value detection circuitry, and reliable and stable, specific working process is as follows: under normal conditions, the wiring terminal J1 is equivalently added with a switch, and when the switch is closed, the diode at the input end of the photoelectric coupler N1 emits light, so that the triode at the output end of the photoelectric coupler N1 is conducted, and the photoelectric coupler N1 outputs low level; on the contrary, if the switch is turned off, the diode at the input end of the photoelectric coupler N1 is extinguished, so that the triode at the output end of the photoelectric coupler N1 is cut off, the photoelectric coupler N1 is pulled up by the resistor R2, and a high level is output;
when surge interference invades between switches realized by a wiring terminal J1, the thermistor PCT1, the fuse F1 and the piezoresistor RV1 act, and the piezoresistor RV1 absorbs most of energy, so that a subsequent circuit is protected;
when electrostatic interference invades between switches realized by the connecting terminal J1, the thermistor PCT1 and the bidirectional electrostatic protection diode D2 act to limit electrostatic energy within an acceptable range, so that a subsequent circuit is protected;
when the voltage of alternating current 220V is connected between switches realized by a connecting terminal J1, the thermistor PCT1 and the bidirectional electrostatic protection diode D2 act, at the moment, the resistance value of the thermistor PCT1 can rise rapidly, most energy is absorbed through self heating, the bidirectional electrostatic protection diode D2 can bear large current at the beginning, the voltage is clamped in a safety range, and therefore a subsequent circuit is protected.
To sum up, the utility model discloses a direct current switching value detection circuitry with electrical protection function for instrument or terminal equipment's inside DC supply's switching value detects, possess fine resistance EMC interference's ability, also has the ability that prevents to exchange 220V and damage, lets the circuit have fine stability, reduces the rate of damage at scene, has multiple electrical protection function, and the circuit is simple, realizes easily, and low cost, can be in instrument or terminal equipment's wide application, has good application prospect.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A DC switching value detection circuit with an electrical protection function is characterized in that: including the opto-coupler N1 which,
a first input end of the photoelectric coupler N1 is connected with a direct current power supply VCC1 through a resistor R1, and the direct current power supply VCC1 is also connected with a digital ground through a bidirectional electrostatic protection diode D1;
a second input end of the photoelectric coupler N1 is connected with one end of a thermistor PTC1 through a fuse F1, the other end of the thermistor PTC1 is connected with one end of a connecting terminal J1, the other end of the connecting terminal J1 is connected with the digital ground, a second input end of the photoelectric coupler N1 is further connected with the digital ground through a piezoresistor RV1, and the connection part of the fuse F1 and the thermistor PTC1 is connected with the digital ground through a bidirectional electrostatic protection diode D2;
the first output end of the photoelectric coupler N1 is connected with a direct-current power supply VCC2 through a resistor R2, the first human output end of the photoelectric coupler N1 is connected with a simulation ground, a capacitor C1 is connected between the first output end and the second output end of the photoelectric coupler N1 in parallel, the first output end of the photoelectric coupler N1 is further connected with the negative electrode of an anti-static diode ESD1, and the second output end of the photoelectric coupler N1 is further connected with the positive electrode of an anti-static diode ESD 1.
2. The direct-current switching value detection circuit with an electrical protection function according to claim 1, characterized in that: the model of the photoelectric coupler N1 is EL 817.
3. The direct-current switching value detection circuit with an electrical protection function according to claim 1, characterized in that: the voltage of the direct current power supply VCC1 is 24V, and the voltage of the direct current power supply VCC2 is 3.3V.
4. The direct-current switching value detection circuit with an electrical protection function according to claim 1, characterized in that: the fuse F1 is a self-restoring fuse.
5. The direct-current switching value detection circuit with an electrical protection function according to claim 1, characterized in that: the type of the thermistor PTC1 is MZ11-06A300-600 rm.
6. The direct-current switching value detection circuit with an electrical protection function according to claim 1, characterized in that: the model of the anti-static diode ESD1 is PESD3V3S2 UT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021916377.9U CN212845680U (en) | 2020-09-04 | 2020-09-04 | Direct current switching value detection circuit with electrical protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021916377.9U CN212845680U (en) | 2020-09-04 | 2020-09-04 | Direct current switching value detection circuit with electrical protection function |
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| Publication Number | Publication Date |
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| CN212845680U true CN212845680U (en) | 2021-03-30 |
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| CN202021916377.9U Active CN212845680U (en) | 2020-09-04 | 2020-09-04 | Direct current switching value detection circuit with electrical protection function |
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| CN (1) | CN212845680U (en) |
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- 2020-09-04 CN CN202021916377.9U patent/CN212845680U/en active Active
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