CN108988842B - High-reliability small-sized inductance type proximity switch - Google Patents
High-reliability small-sized inductance type proximity switch Download PDFInfo
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- CN108988842B CN108988842B CN201810594965.6A CN201810594965A CN108988842B CN 108988842 B CN108988842 B CN 108988842B CN 201810594965 A CN201810594965 A CN 201810594965A CN 108988842 B CN108988842 B CN 108988842B
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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
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K17/95—Proximity switches using a magnetic detector
- H03K17/952—Proximity switches using a magnetic detector using inductive coils
Abstract
The invention provides a high-reliability small inductance type proximity switch which comprises a shell, a lampshade, a cable sealing ring, a circuit board, an electronic component, an indicator light, a magnetic core, a coil and a cable. Through the implementation of the invention, the functions of switch protection, load protection and wide temperature range (-55 ℃ to +125 ℃) use are realized by adding the circuit protection circuit and the high-precision temperature compensation circuit in the induction switch, the reliability of the switch is greatly improved, meanwhile, polyurethane resin glue is poured at the installation position of the circuit board in the shell, the installation position of each electronic component on the circuit board can be flexibly stabilized, the circuit board is well protected, and a focus can be isolated when vibration occurs outside the induction switch.
Description
Technical Field
The invention belongs to the field of automation of electric appliances, and particularly relates to a high-reliability small inductance type proximity switch.
Background
The high-reliability small-sized inductive proximity switch consists of four parts: the circuit comprises an oscillator, a detection circuit, an amplification output circuit and a protection circuit. The oscillator generates an alternating magnetic field. When a metal target approaches this magnetic field and reaches an induction distance, eddy currents are generated within the metal target, causing oscillations to decay to a stop. The oscillation and stop variation of the oscillator is processed by the post-stage amplifying circuit and converted into a switching signal to trigger the drive control device, thereby achieving the purpose of non-contact detection.
The traditional proximity switch has a low temperature range (-25 ℃ to +70 ℃) and no self-protection function, when the service temperature of the switch exceeds the upper limit and the lower limit, the parameters of a transistor in a circuit are remarkably changed, so that the static working point is seriously drifted, the dynamic parameters of the circuit are unstable, and even the switch cannot normally work; when the switching circuit is reversely connected or the output portion is short-circuited, the switch is easily damaged or the load is easily damaged.
Drawings
FIG. 1 is a schematic diagram of the present invention.
In the figure: the device comprises a shell, a circuit board, an indicator light, a magnetic core, a cable, a lamp shade, a cable sealing ring, a coil, an electronic component and an induction surface, wherein the shell is 1 part, the circuit board is 2 part, the indicator light is 3 part, the magnetic core is 4 part, the cable is 5 part, the lamp shade is 6 part, the cable sealing ring is 7 part, the coil is 8 part, the electronic component is 9 part, and the induction surface is 10 part.
FIG. 2 is a block circuit diagram of the present invention;
fig. 3 is a circuit schematic of the present invention.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-reliability small-sized inductive proximity switch which has the advantages of wide temperature range use and self-protection, and greatly improves the reliability of the switch.
The invention is realized by the following technical scheme.
The invention provides a high-reliability small inductance type proximity switch, which comprises a shell, a circuit board, an indicator light, a cable, a lampshade and a coil, wherein the circuit board is arranged on the shell; the circuit board, the magnetic core and the coil are arranged in the shell, wherein the coil is wound on the magnetic core and is connected to the circuit board; the magnetic core is arranged close to the inner wall of the shell; the indicating lamp is arranged on the circuit board and close to the inner wall of the shell; the lampshade is arranged on the shell and corresponds to the position of the indicating lamp, and the light of the indicating lamp can be transmitted out of the shell through the lampshade; the cable enters the shell from the outside and is connected with the circuit board; the switch induction surface is arranged on the outer surface of the shell and corresponds to the position of the magnetic core.
Further, the magnetic core is made of slot-shaped iron oxide.
Furthermore, the winding of the coil is a plurality of strands of enameled wires with the diameter phi of 0.1mm, and the enameled wires are wound on the central column of the magnetic core in a winding mode.
Furthermore, a plurality of electronic components are mounted on the circuit board.
Further, polyurethane resin glue is filled in the shell.
Furthermore, the cable sealing ring is arranged on the shell, and the cable penetrates through the cable sealing ring to enter the shell.
Furthermore, the circuit of the circuit board consists of an oscillating circuit, a detection circuit, a trigger circuit, an amplification output circuit and a protection circuit;
the magnetic core, the coil, the third capacitor C3, the fourth capacitor C4, the seventh resistor R7 and the ninth resistor R9 form the oscillating circuit; one end of a third capacitor C3 is connected with an eleventh resistor R11, a seventh triode Q7 and a seventh triode, and the other end is connected with a fourth capacitor C4, a seventh resistor R7 and a first inductor L1; one end of the fourth capacitor C4 is connected to the third capacitor C3 and the seventh resistor R7, and the other end is connected to the second inductor L2 and the eighth triode Q8; one end of the seventh resistor R7 is connected to the third capacitor C3, the fourth capacitor C4 and the first inductor L1, and the other end is connected to the sixth resistor R6, the second capacitor C2 and the fifth triode Q5; one end of the ninth resistor R9 is connected to the eleventh resistor R11 and the third capacitor C3, and the other end is connected to the bases of the seventh triode Q7 and the eighth triode Q8;
the second capacitor C2 and the sixth resistor R6 form a detection circuit, one end of the second capacitor C2 is connected with the fifth resistor R5, the sixth resistor R6, the second triode Q2 and the third resistor R3, and the other end is connected with the base of the fifth triode Q5, the other end of the sixth resistor R6 and the seventh resistor R7;
a trigger circuit is formed by a fifth triode Q5, a sixth triode Q6, a fifth resistor R5, an eleventh resistor R11, a twelfth resistor R12, a light-emitting diode LED1 and a first diode D1 which are connected with the detection circuit, one end of the fifth triode Q5 is connected with the fifth resistor R5 and the sixth triode Q6, the other end of the fifth triode Q5 is connected with the base of the sixth triode Q6 and the eleventh resistor R11, and the base of the fifth triode Q5 is connected with a second capacitor C2, a sixth resistor R6 and a seventh resistor R7; one end of a sixth triode Q6 is connected with a fifth resistor R5 and a fifth triode Q5, the other end of the sixth triode Q6 is connected with a twelfth resistor R12, and the base of the sixth triode Q6 is connected with a fifth triode Q5 and an eleventh resistor R11; one end of a fifth resistor R5 is connected with a fifth triode Q5, and the other end of the fifth resistor R5 is connected with a second capacitor C2; one end of an eleventh resistor R11 is connected with the bases of a fifth triode Q5 and a sixth triode Q6, and the other end is connected with a third capacitor C3, a thirteenth resistor R13, a fifth capacitor C5 and a fifteenth resistor R15; one end of a twelfth resistor R12 is connected with the sixth triode Q6, and the other end of the twelfth resistor R12 is connected with the light emitting diode LED 1; one end of the light emitting diode LED1 is connected to the twelfth resistor R12, and the other end is connected to the base of the third transistor Q3, the fourth transistor Q4, the seventh capacitor C7, the sixth capacitor C6, the ninth transistor Q9, and the thirteenth resistor R13; one end of the first diode D1 is connected to one end of the first triode Q1 and the base of the first triode Q1, and the other end is connected to the second diode D2, the third diode D3, the first capacitor C1, the seventh triode Q7 and the fourth diode D4;
the light emitting diode LED1, the third triode Q3, the thirteenth resistor R13, the first triode Q1 and the second triode Q2 form an amplification output circuit; one end of the light emitting diode LED1 is connected to the twelfth resistor R12, and the other end is connected to the thirteenth resistor R13, one end of the ninth triode Q9, the sixth capacitor C6, the seventh capacitor C7, and the base of the third triode Q3; one end of a thirteenth resistor R13 is connected with the light emitting diode LED1, one end of a ninth triode Q9, the base electrodes of a sixth capacitor C6, a seventh capacitor C7 and a third triode Q3, and the other end of the thirteenth resistor R13 is connected with a fifth capacitor C5, a fifteenth resistor R15, an eighth capacitor C8, a fourth triode Q4 and a sixteenth resistor R16; one end of a first triode Q1 is connected to a first diode D1 and the output end, the other end of the first triode Q1 is connected to a first resistor R1, and the base of the first triode Q1 is connected to a third triode Q3 and a first diode D1; one end of the second triode Q2 is connected to the second resistor R2 and the third resistor R3, the other end is connected to the other end of the third resistor R3, the sixth resistor R6, the second capacitor C2 and the fifth resistor R5, and the base is connected to the other end of the second resistor R2 and the fourth diode D4;
the protection circuit comprises a short-circuit protection circuit and a reverse polarity protection circuit, wherein the short-circuit protection circuit consists of a fourth triode Q4, a ninth triode Q9, a seventh capacitor C7 and an eighth capacitor C8;
the reverse polarity protection circuit is composed of a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and an eighth resistor R8; one end of the first diode D1 is connected with one end and a base of the first triode Q1, and the other end is connected with the third triode D3, the first capacitor C1, the fourth diode D4, the seventh triode Q7, the third capacitor C3, the ninth resistor R9 and the eleventh resistor R11; one end of the second diode D2 is connected to the VCC terminal, and the other end is connected to the first diode D1, the third triode D3, the first capacitor C1, the fourth diode D4, the seventh triode Q7, the third capacitor C3, the ninth resistor R9, and the eleventh resistor R11; one end of a fourth diode D4 is connected to the second resistor R2 and the base of the second triode Q3, and the other end is connected to the first diode D1, the second diode D2, the third triode D3, the first capacitor C1, the seventh triode Q7, the third capacitor C3, the ninth resistor R9 and the eleventh resistor R11; one end of the eighth resistor R8 is connected to the third transistor D3, the first capacitor C1, the third resistor R3, the second transistor Q2, the second resistor R2 and the first resistor R1, and the other end is grounded.
Further, the housing 1 is made of a metal material.
Further, the housing 1 is made of plastic.
The invention has the beneficial effects that: through the implementation of the invention, the functions of switch protection, load protection and wide temperature range (-55 ℃ to +125 ℃) use are realized by adding the circuit protection circuit and the high-precision temperature compensation circuit in the induction switch, the reliability of the switch is greatly improved, meanwhile, polyurethane resin glue is poured at the installation position of the circuit board in the shell, the installation position of each electronic component on the circuit board can be flexibly stabilized, the circuit board is well protected, and a focus can be isolated when vibration occurs outside the induction switch.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1-3, the high-reliability small-sized inductive proximity switch of the present invention comprises a housing 1, a circuit board 2, an indicator light 3, a magnetic core 4, a cable 5, a lampshade 6 and a coil 8; the circuit board 2, the magnetic core 4 and the coil 8 are arranged in the shell 1, wherein the coil 8 is wound on the magnetic core 4 and is connected to the circuit board 2; the magnetic core 4 is arranged close to the inner wall of the shell 1; the indicator light 3 is arranged on the circuit board 2 and close to the inner wall of the shell 1; the lampshade 6 is arranged on the shell 1 and corresponds to the position of the indicator lamp 3, and the light of the indicator lamp 3 can be transmitted out of the shell 1 through the lampshade 6; the cable 5 enters the housing 1 from the outside and is connected with the circuit board 2; the switch sensing surface 10 is disposed on the outer surface of the housing 1 and corresponds to the position of the magnetic core 4.
Further, the magnetic core 4 is a slot-shaped iron oxide.
Furthermore, the winding of the coil 8 is a multi-strand enameled wire with the diameter phi of 0.1mm, and the enameled wire is wound on the central column of the magnetic core 4 in a winding manner.
Further, a plurality of electronic components 9 are mounted on the circuit board 2.
Further, polyurethane resin glue is filled in the shell 1.
Further, a cable sealing ring 7 is arranged on the shell 1, and the cable 5 penetrates through the cable sealing ring 7 to enter the shell 1.
Furthermore, the circuit of the circuit board 2 consists of an oscillation circuit, a detection circuit, a trigger circuit, an amplification output circuit and a protection circuit;
the magnetic core 4, the coil 8, the third capacitor C3, the fourth capacitor C4, the seventh resistor R7 and the ninth resistor R9 form the oscillating circuit; one end of a third capacitor C3 is connected with the eleventh resistor R11, the collector of the seventh triode Q7 and the ninth resistor R9, and the other end is connected with the fourth capacitor C4, the seventh resistor R7 and the first inductor L1; one end of the fourth capacitor C4 is connected to the third capacitor C3 and the seventh resistor R7, and the other end is connected to the second inductor L2 and the emitter of the eighth triode Q8; one end of the seventh resistor R7 is connected to the third capacitor C3, the fourth capacitor C4 and the first inductor L1, and the other end is connected to the sixth resistor R6, the second capacitor C2 and the base of the fifth triode Q5; one end of the ninth resistor R9 is connected with the eleventh resistor R11 and the third capacitor C3, and the other end is connected with the base of the seventh triode Q7 and the base of the eighth triode Q8;
the second capacitor C2 and the sixth resistor R6 form a detection circuit, one end of the second capacitor C2 is connected with the fifth resistor R5, the sixth resistor R6, the emitter of the second triode Q2 and the third resistor R3, and the other end is connected with the base of the fifth triode Q5, the other end of the sixth resistor R6 and the seventh resistor R7;
a trigger circuit is formed by a fifth triode Q5, a sixth triode Q6, a fifth resistor R5, an eleventh resistor R11, a twelfth resistor R12, a light-emitting diode LED1 and a first diode D1 which are connected with the detection circuit, an emitter of the fifth triode Q5 is connected with the fifth resistor R5 and an emitter of the sixth triode Q6, a collector at the other end is connected with a base of the sixth triode Q6 and the eleventh resistor R11, and a base of a fifth triode Q5 is connected with a second capacitor C2, a sixth resistor R6 and a seventh resistor R7; an emitter of the sixth triode Q6 is connected with the fifth resistor R5 and an emitter of the fifth triode Q5, a collector of the other end of the sixth triode Q6 is connected with the twelfth resistor R12, and a base of the sixth triode Q6 is connected with the fifth triode Q5 and the eleventh resistor R11; one end of a fifth resistor R5 is connected with an emitter of a fifth triode Q5, and the other end of the fifth resistor R5 is connected with a second capacitor C2; one end of an eleventh resistor R11 is connected with the collector of the fifth triode Q5 and the base of the sixth triode Q6, and the other end is connected with a third capacitor C3, a thirteenth resistor R13, a fifth capacitor C5 and a fifteenth resistor R15; one end of a twelfth resistor R12 is connected with the collector of the sixth triode Q6, and the other end of the twelfth resistor R12 is connected with a light-emitting diode LED 1; one end of the light emitting diode LED1 is connected to the twelfth resistor R12, and the other end is connected to the base of the third transistor Q3, the collector of the fourth transistor Q4, the seventh capacitor C7, the sixth capacitor C6, the emitter of the ninth transistor Q9, and the thirteenth resistor R13; one end of the first diode D1 is connected with the emitter of the first triode Q1 and the base of the first triode Q1, and the other end is connected with the second diode D2, the third diode D3, the first capacitor C1, the collector of the seventh triode Q7 and the fourth diode D4;
the light emitting diode LED1, the third triode Q3, the thirteenth resistor R13, the first triode Q1 and the second triode Q2 form an amplification output circuit; one end of the light emitting diode LED1 is connected with the twelfth resistor R12, and the other end is connected with the thirteenth resistor R13, the emitter of the ninth triode Q9, the sixth capacitor C6, the seventh capacitor C7 and the base of the third triode Q3; one end of a thirteenth resistor R13 is connected with the light emitting diode LED1, the emitter of the ninth triode Q9, the base of a sixth capacitor C6, the base of a seventh capacitor C7 and the base of a third triode Q3, and the other end of the thirteenth resistor R13 is connected with the fifth capacitor C5, the emitter of a fifteenth resistor R15, the base of an eighth capacitor C8, the emitter of a fourth triode Q4 and the base of a sixteenth resistor R16; an emitter and a base of the first triode Q1 are connected to the first diode D1 and the output end, a collector at the other end is connected with the first resistor R1, and a base is connected with a collector of the third triode Q3 and the first diode D1; a collector of the second triode Q2 is connected to the second resistor R2 and the third resistor R3, an emitter at the other end is connected to the other end of the third resistor R3, the sixth resistor R6, the second capacitor C2 and the fifth resistor R5, and a base is connected to the other end of the second resistor R2 and the fourth diode D4;
the protection circuit comprises a short-circuit protection circuit and a reverse polarity protection circuit, wherein the short-circuit protection circuit consists of a fourth triode Q4, a ninth triode Q9, a seventh capacitor C7 and an eighth capacitor C8;
the reverse polarity protection circuit is composed of a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and an eighth resistor R8; one end of the first diode D1 is connected with the emitter and the base of the first triode Q1, and the other end is connected with the third triode D3, the first capacitor C1, the fourth diode D4, the collector of the seventh triode Q7, the third capacitor C3, the ninth resistor R9 and the eleventh resistor R11; one end of the second diode D2 is connected to the VCC terminal, and the other end is connected to the first diode D1, the third diode D3, the first capacitor C1, the fourth diode D4, the collector of the seventh triode Q7, the third capacitor C3, the ninth resistor R9, and the eleventh resistor R11; one end of a fourth diode D4 is connected to the second resistor R2 and the base of the second triode Q3, and the other end is connected to the collector of the first diode D1, the second diode D2, the third diode D3, the first capacitor C1, the seventh triode Q7, the third capacitor C3, the ninth resistor R9 and the eleventh resistor R11; one end of the eighth resistor R8 is connected to the third diode D3, the first capacitor C1, the third resistor R3, the collector of the second transistor Q2, the second resistor R2, and the first resistor R1, and the other end is grounded.
Further, the housing 1 is made of a metal material.
Further, the housing 1 is made of plastic.
In the invention, a magnetic core 4, a coil 8, a third capacitor C3, a fourth capacitor C4, a seventh resistor R7 and a ninth resistor R9 are connected in series and in parallel to form an oscillator, the oscillator generates a high-frequency alternating electric field, then the alternating electric field generates an alternating magnetic field, the alternating magnetic field is led out by the coil 8 and then is emitted from a sensor induction surface 10. When a metal object approaches the electromagnetic field, eddy current is generated in the metal object, and due to the demagnetization effect of the eddy current, the generation of the eddy current draws the energy of the electromagnetic field and the oscillator, so that the oscillation of the oscillating circuit is prevented. When the metal object is close to the inductive surface 10 of the proximity switch, the oscillation amplitude is smaller until the oscillation stops, and when the oscillation amplitude reaches a set value, the detector circuit composed of the second capacitor C2 and the sixth resistor R6 reaches a trigger level, so that the trigger circuit works, wherein the trigger circuit comprises a fifth triode Q5 connected with the detector circuit, a triode sixth triode Q6 and a fifth resistor R5 connected with the collector and the emitter of the triode fifth triode Q5, an eleventh resistor R11, a twelfth resistor R12 and a first diode D1 of a light emitting diode LED1 connected with the collector of the sixth triode Q6, a collector of a fourth triode Q4 connected with the first diode D1 of the light emitting diode LED1, an emitter of a ninth triode Q9, a sixth capacitor C6, a seventh capacitor C7, a thirteenth resistor R13, a first resistor R14 connected with the base of the ninth triode Q9, and a short-circuit protection circuit composed of the fourteenth resistor R4 and the collector C5 The circuit comprises triodes (a third triode Q3, a first resistor R1, a second resistor R2, a third resistor R3, a first triode Q1 and a second triode Q2) which are connected with the light-emitting diode (LE first diode D1) to form the amplification output circuit for outputting signals, a fourth diode D4 connected with the base electrode of the second triode Q2 and a first diode D1, a second diode D2 and a third diode D3 which are connected with the fourth diode D4 to form a reverse polarity protection circuit in the protection circuit, and temperature compensation circuits are designed in the oscillating circuit, the wave detection circuit, the trigger circuit, the amplification output circuit and the protection circuit to ensure that the proximity switch can be normally used in a wide temperature range (-55 ℃ to +125 ℃).
Claims (8)
1. An inductive proximity switch, comprising: the LED lamp comprises a shell (1), a circuit board (2), an indicator light (3), a magnetic core (4), a cable (5), a lampshade (6) and a coil (8); the circuit board (2), the magnetic core (4) and the coil (8) are arranged in the shell (1), wherein the coil (8) is wound on the magnetic core (4) and connected to the circuit board (2); the magnetic core (4) is arranged close to the inner wall of the shell (1); the indicator light (3) is arranged on the circuit board (2) and close to the inner wall of the shell (1); the lampshade (6) is arranged on the shell (1) and corresponds to the position of the indicating lamp (3), and the light of the indicating lamp (3) can be transmitted out of the shell (1) through the lampshade (6); the cable (5) enters the shell (1) from the outside and is connected with the circuit board (2); the switch induction surface (10) is arranged on the outer surface of the shell (1) and corresponds to the position of the magnetic core (4);
the circuit of the circuit board (2) consists of an oscillating circuit, a detection circuit, a trigger circuit, an amplification output circuit and a protection circuit;
the magnetic core (4), the coil (8), the third capacitor C3, the fourth capacitor C4, the seventh resistor R7 and the ninth resistor R9 form the oscillating circuit; one end of the third capacitor C3 is connected to one end of the eleventh resistor R11 and the collector of the seventh transistor Q7, and the other end is connected to one end of the fourth capacitor C4, one end of the seventh resistor R7, and one end of the first inductor L1; the other end of the fourth capacitor C4 is connected to one end of the second inductor L2 and the emitter of the eighth transistor Q8; the other end of the seventh resistor R7 is connected with one end of the sixth resistor R6, one end of the second capacitor C2 and the base of the fifth triode Q5; one end of the ninth resistor R9 is connected to one end of the eleventh resistor R11 and one end of the third capacitor C3, and the other end is connected to the base of the seventh triode Q7 and the base of the eighth triode Q8;
the second capacitor C2 and the sixth resistor R6 form a detection circuit, one end of the second capacitor C2 is connected with one end of the fifth resistor R5, one end of the sixth resistor R6, an emitter of the second triode Q2 and one end of the third resistor R3, and the other end of the second capacitor C2 is connected with a base of the fifth triode Q5, the other end of the sixth resistor R6 and the other end of the seventh resistor R7;
a trigger circuit is formed by a fifth triode Q5, a sixth triode Q6, a fifth resistor R5, an eleventh resistor R11, a twelfth resistor R12, a light-emitting diode LED1 and a first diode D1 which are connected with the detection circuit, an emitter of the fifth triode Q5 is connected with the other end of the fifth resistor R5 and an emitter of the sixth triode Q6, a collector of the other end of the fifth triode Q5 is connected with a base of the sixth triode Q6 and one end of the eleventh resistor R11, and a base of the fifth triode Q5 is connected with the other end of the second capacitor C2, the other end of the sixth resistor R6 and the other end of the seventh resistor R7; an emitter of the sixth triode Q6 is connected with the other end of the fifth resistor R5 and an emitter of the fifth triode Q5, a collector is connected with one end of the twelfth resistor R12, and a base of the sixth triode Q6 is connected with a collector of the fifth triode Q5 and one end of the eleventh resistor R11; the other end of the fifth resistor R5 is connected to the emitter of the fifth transistor Q5, and one end of the fifth resistor R5 is connected to the second capacitor C2; one end of an eleventh resistor R11 is connected to the collector of the fifth triode Q5 and the base of the sixth triode Q6, and the other end is connected to one end of the third capacitor C3, one end of the thirteenth resistor R13, one end of the fifth capacitor C5 and one end of the fifteenth resistor R15; one end of a twelfth resistor R12 is connected with the collector of the sixth triode Q6, and the other end of the twelfth resistor R12 is connected with the emitting end of the light emitting diode LED 1; the other end of the light emitting diode LED1 is connected to the base of the third transistor Q3, the collector of the fourth transistor Q4, one end of the seventh capacitor C7, one end of the sixth capacitor C6, the emitter of the ninth transistor Q9 and the other end of the thirteenth resistor R13; one end of the first diode D1 is connected to an emitter of the first triode Q1 and a base of the first triode Q1, and an emitter is connected to an emitter of the second diode D2, an emitter of the third diode D3, one end of the first capacitor C1, a collector of the seventh triode Q7, and an emitter of the fourth diode D4;
the light emitting diode LED1, the third triode Q3, the thirteenth resistor R13, the first triode Q1 and the second triode Q2 form an amplification output circuit; the emitting end of the light emitting diode LED1 is connected to the other end of the twelfth resistor R12, and the other end of the light emitting diode LED1 is connected to the other end of the thirteenth resistor R13, the emitter of the ninth triode Q9, one end of the sixth capacitor C6, one end of the seventh capacitor C7, and the base of the third triode Q3; the other end of the thirteenth resistor R13 is connected to the other end of the light emitting diode LED1, the emitter of the ninth triode Q9, one end of the sixth capacitor C6, one end of the seventh capacitor C7, the base of the third triode Q3, and the collector of the fourth triode Q4, one end of which is connected to one end of the fifth capacitor C5, and the other end of the fifteenth resistor R15 is connected to one end of the eighth capacitor C8 and one end of the sixteenth resistor R16; the collector of the first triode Q1 is connected with one end of the first resistor R1, and the base of the first triode Q1 is connected with the collector of the third triode Q3; a collector of the second triode Q2 is connected to one end of the second resistor R2 and one end of the third resistor R3, an emitter is connected to the other end of the third resistor R3, one end of the sixth resistor R6, one end of the second capacitor C2 and one end of the fifth resistor R5, and a base is connected to the other end of the second resistor R2 and the other end of the fourth diode D4;
the protection circuit comprises a short-circuit protection circuit and a reverse polarity protection circuit, wherein the short-circuit protection circuit consists of a fourth triode Q4, a ninth triode Q9, a seventh capacitor C7 and an eighth capacitor C8;
the reverse polarity protection circuit is composed of a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and an eighth resistor R8; an emitting end of the first diode D1 is connected to an emitting end of the third diode D3, one end of the first capacitor C1, an emitting end of the fourth diode D4, a collector of the seventh transistor Q7, one end of the third capacitor C3, one end of the ninth resistor R9, and the other end of the eleventh resistor R11; the other end of the second diode D2 is connected with a VCC end, the emission end is connected with the emission end of the first diode D1, the emission end of the third diode D3, one end of the first capacitor C1, the emission end of the fourth diode D4, the collector of the seventh triode Q7, one end of the third capacitor C3, one end of a ninth resistor R9 and the other end of an eleventh resistor R11; one end of an eighth resistor R8 is connected to the other end of the third diode D3, the other end of the first capacitor C1, one end of the third resistor R3, the collector of the second triode Q2, one end of the second resistor R2, and the other end of the first resistor R1, and the other end is grounded.
2. The inductive proximity switch of claim 1, wherein: the magnetic core (4) is groove-shaped iron oxide.
3. The inductive proximity switch of claim 1, wherein: and the winding of the coil (8) is a multi-strand enameled wire with the diameter phi of 0.1mm and wound on the central column of the magnetic core (4).
4. The inductive proximity switch of claim 1, wherein: a plurality of electronic components (9) are mounted on the circuit board (2).
5. The inductive proximity switch of claim 1, wherein: polyurethane resin glue is filled in the shell (1).
6. The inductive proximity switch of claim 1, wherein: the cable sealing device is characterized by further comprising a cable sealing ring (7) arranged on the shell (1), and the cable (5) penetrates through the cable sealing ring (7) to enter the shell (1).
7. The inductive proximity switch of claim 1, wherein: the shell (1) is made of metal materials.
8. The inductive proximity switch of claim 1, wherein: the shell (1) is made of plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810594965.6A CN108988842B (en) | 2018-06-11 | 2018-06-11 | High-reliability small-sized inductance type proximity switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810594965.6A CN108988842B (en) | 2018-06-11 | 2018-06-11 | High-reliability small-sized inductance type proximity switch |
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