CN214626950U

CN214626950U - Approach switch for controlling AC contactor

Info

Publication number: CN214626950U
Application number: CN202023003663.9U
Authority: CN
Inventors: 王进升; 吴克军; 王学
Original assignee: Nanjing Qianneng Sensing Technology Co ltd
Current assignee: Nanjing Qianneng Sensing Technology Co ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-11-05
Anticipated expiration: 2030-12-14

Abstract

The utility model relates to a control ac contactor's proximity switch, including the rectification filtering module, the input of rectification filtering module links to each other with alternating current power supply, and the output of rectification filtering module passes through zener diode D2 and links to each other with three terminal regulator U1's input, and three terminal regulator U1's output links to each other with sensor chip H1's power port, and sensor chip H1's signal output part passes through resistance R1 and links to each other with triode T1's base; an emitter electrode of the triode T1 is connected with a collector electrode of the triode T2 through a resistor R4, a collector electrode of the triode T1 is grounded through a resistor R3 and is connected with a base electrode of the triode T2 through a resistor R2, an emitter electrode of the triode T2 is connected with an input end of an optocoupler relay U2, and an output end of the optocoupler relay U2 is connected with a coil loop of the alternating current contactor; the transistor T1 is a PNP transistor, and the transistor T2 is an NPN transistor. The proximity switch can realize the power supply of an alternating current power supply and control an alternating current load, and has the advantages of low manufacturing cost, good safety and long service life.

Description

Approach switch for controlling AC contactor

Technical Field

The utility model relates to a control ac contactor's proximity switch belongs to intelligent switch technical field.

Background

The alternating current contactor is a common control electrical appliance in an electrical control module, and generally controls ports A1 and A2 on the contactor through one path of voltage, and the contactor controls the on-off of three-phase power through the open and closed states of contacts so as to control the rotation and stop of a motor. The working principle of the alternating current contactor is that the contact is connected and disconnected by matching electromagnetic force with the elastic force of a spring. The alternating current contactor has two working states, namely a power-off state (release state) and a power-on state (action state). When the attraction coil is powered off, the electromagnetic attraction disappears, the armature resets under the action of the spring, so that the normally closed contact is restored to a closed state, and the normally open contact is opened.

The workpiece moves on the console through the starting and stopping of the motor, and due to inertia action or misoperation, the workpiece possibly exceeds the working table surface, so that the workpiece is damaged or personnel injury accidents are caused. Whether the workpiece exceeds the limit is detected through the positioning sensor, and accidents are prevented. The traditional positioning mode is a passive mechanical positioning switch, when a workpiece touches the positioning switch, the switch is closed, the power supply of the motor is disconnected, and the motor stops running. The control mode does not need an external power supply, controls large current and can control alternating current and direct current power supplies, but is easy to damage due to collision because of touch type work; at the closing moment, due to pitting corrosion generated by current, the surface is easy to oxidize to generate poor contact, so that control failure is caused to form potential safety hazard.

The proximity switch is a device capable of sensing the approach of an object, and recognizes the approach of the object by using the sensitivity characteristic of a displacement sensor to the approaching object, and outputs a corresponding switch signal. Proximity switches include photoelectric, inductive, capacitive, hall, and the like. Most of proximity switches in the market are mainly powered by direct current low voltage, output signals are direct current control signals, and alternating current signals cannot be controlled; some products are AC power supplies and output AC electric signals, such as two-wire system inductance proximity switches and three-wire system Hall type proximity switches, which have large volume and high price and cannot replace original mechanical positioning switches in a large scale.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the problem that exists among the prior art, provide a control ac contactor's proximity switch, can realize the alternating current power supply, control alternating current load, and overall dimension is little, low in manufacturing cost, and the security is good, long service life.

In order to solve the technical problem, the utility model provides a control ac contactor's proximity switch, including the rectification filter module, the input of rectification filter module links to each other with alternating current power supply, the output of rectification filter module passes through zener diode D2 and links to each other with three terminal regulator U1's input, and three terminal regulator U1's output links to each other with sensor chip H1's power port, and sensor chip H1's signal output part passes through resistance R1 and links to each other with triode T1's base; an emitter electrode of the triode T1 is connected with a collector electrode of the triode T2 through a resistor R4, a collector electrode of the triode T1 is grounded through a resistor R3 and is connected with a base electrode of the triode T2 through a resistor R2, an emitter electrode of the triode T2 is connected with an input end of an optocoupler relay U2, and an output end of the optocoupler relay U2 is connected with a coil loop of the alternating current contactor; the transistor T1 is a PNP transistor, and the transistor T2 is an NPN transistor.

Further, the rectifying and filtering module comprises a rectifier D1, a pin 1 and a pin 3 of a rectifier D1 are connected with an alternating current power supply, a pin 4 of a rectifier D1 is grounded, a pin 2 of the rectifier D1 is connected with a cathode of a voltage stabilizing diode D2, and an anode of a voltage stabilizing diode D2 is connected with a pin 1 of a three-terminal regulator U1; the pin 2 of the rectifier D1 is grounded through a filter capacitor C1, and the filter capacitor C1 is an electrolytic capacitor with the capacity of 10 muF; the pin 2 of the rectifier D1 is also grounded through a filter capacitor C3, and the filter capacitor C3 is an X7R capacitor with the capacity of 0.1 muF.

Further, a pin 3 of the three-terminal voltage regulator U1 is grounded through a filter capacitor C2, and the filter capacitor C2 is an electrolytic capacitor with the capacity of 10 muF; the pin 3 of the three-terminal voltage regulator U1 is also grounded through a filter capacitor C4, and the filter capacitor C4 is an X7R capacitor with the capacity of 0.1 muF.

Further, the model of the three-terminal voltage regulator U1 is P6KE12CA7812, and the model of the optocoupler relay U2 is AQH 3213.

Further, the resistance of the resistor R1 is 5.1k Ω, the resistance of the resistor R2 is 5.1k Ω, the resistance of the resistor R3 is 10k Ω, and the resistance of the resistor R4 is 10k Ω.

Further, the voltage of the alternating current power supply is 24V.

Further, the sensor is a hall sensor of HAL132 type.

The utility model has the advantages that: 1. the proximity switch firstly rectifies 24V alternating current into direct current through a rectifier D1, and carries out filtering through a filter capacitor C1 and a filter capacitor C3, wherein the filter capacitor C1 is a large-capacity electrolytic capacitor and converts the rectified direct current pulse signal into a linear direct current signal; the filter capacitor C3 is a small-capacity X7R capacitor and is responsible for filtering high-frequency interference signals; the rectified and filtered direct-current power supply is subjected to voltage division and stabilization through a voltage stabilizing diode D2, is subjected to voltage stabilization through a three-terminal voltage stabilizer U1, and is subjected to secondary filtering through a filter capacitor C2 and a filter capacitor C4, so that the safe and stable working voltage of the sensor chip H1 is provided.

2. When the S pole of the magnetic steel is close to the sensor, the sensor chip H1 outputs a current signal, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the triode T1 and the triode T2 form a signal power amplification and logic judgment circuit, the sensor signal is amplified to trigger the light-emitting diode at the input end of the optocoupler relay U2 to be lightened, the output end of the optocoupler relay U2 is conducted to enable the coil of the alternating current contactor to be electrified, the normally open contact of the alternating current contactor is closed, and the normally closed contact is opened. When the magnetic steel leaves the sensor, the light emitting diode at the input end of the optocoupler relay U2 is turned off, the output end of the optocoupler relay U2 is disconnected, a coil of the alternating current contactor loses power, a normally open contact of the alternating current contactor is disconnected, and the normally closed contact is closed.

3. The sensor chip H1 can drive several tens mA, several hundreds mA, even 1000mA currents by outputting a few mA current, and the control between different voltages can be realized through the circuit. The circuit realizes the functions of supplying power by the alternating current power supply and controlling the alternating current load.

4. Compared with an inductive sensor, the detection control mode of the Hall sensor and the optocoupler relay U2 is adopted, so that the size is smaller, and the cost is relatively low. The size of the inductive sensor on the market is M18 multiplied by 52 or M18 multiplied by 62, and the driving capacity is only 300 mA; and the utility model relates to a size of sensor is only M12X 50, and the volume has obtained reducing, and the driving force can reach 1000mA, compares in present product, and the performance has obtained the promotion.

5. The utility model adopts the Hall element non-contact type induction mode, ensures that the workpiece is controlled by the motor to react in advance under the condition of keeping a certain distance, and simultaneously avoids the phenomena of easy damage and point corrosion of mechanical contact; the control mode of the isolation of the optical coupling relay is adopted, so that the mutual interference between a power supply and a controlled object can be prevented, the control mode of controlling strong voltage by weak voltage can be realized, and the capability of driving large current is realized.

Drawings

Fig. 1 is an electrical schematic diagram of the present invention.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1, the utility model discloses a control ac contactor's proximity switch, including the rectification filter module, the input of rectification filter module links to each other with alternating current power supply, and alternating current power supply's voltage can be 24V. The rectification filtering module comprises a rectifier D1, a pin 1 and a pin 3 of the rectifier D1 are connected with an alternating current power supply, a pin 4 of the rectifier D1 is grounded, a pin 2 of the rectifier D1 is connected with the cathode of a voltage stabilizing diode D2, and the anode of the voltage stabilizing diode D2 is connected with a pin 1 of a three-terminal regulator U1; pin 2 of the rectifier D1 is grounded through a filter capacitor C1, and the filter capacitor C1 is an electrolytic capacitor with the capacity of 10 muF; pin 2 of the rectifier D1 is also grounded through a filter capacitor C3, and the filter capacitor C3 is an X7R capacitor with a capacitance of 0.1 μ F. The resistance of the resistor R1 is 5.1k omega, the resistance of the resistor R2 is 5.1k omega, the resistance of the resistor R3 is 10k omega, and the resistance of the resistor R4 is 10k omega.

The model of the three-terminal voltage stabilizer U1 is P6KE12CA7812, the pin 3 of the three-terminal voltage stabilizer U1 is grounded through a filter capacitor C2, and the filter capacitor C2 is an electrolytic capacitor with the capacity of 10 muF; the pin 3 of the three-terminal voltage regulator U1 is also grounded through a filter capacitor C4, and the filter capacitor C4 is an X7R capacitor with the capacity of 0.1 muF.

The output end of the rectifying and filtering module is connected with the input end of a three-terminal regulator U1 through a voltage stabilizing diode D2, the output end of the three-terminal regulator U1 is connected with a power supply port of a sensor chip H1, and the sensor can be an HAL132 type Hall sensor. The signal output end of the sensor chip H1 is connected with the base electrode of the triode T1 through a resistor R1; an emitter electrode of the triode T1 is connected with a collector electrode of the triode T2 through a resistor R4, a collector electrode of the triode T1 is grounded through a resistor R3 and is connected with a base electrode of the triode T2 through a resistor R2, an emitter electrode of the triode T2 is connected with an input end of an optocoupler relay U2, and an output end of the optocoupler relay U2 is connected with a coil loop of the alternating current contactor; the triode T1 is a PNP type triode, the triode T2 is an NPN type triode, and the model number of the optocoupler relay U2 is AQH 3213.

The proximity switch firstly rectifies 24V alternating current into direct current through a rectifier D1, and carries out filtering through a filter capacitor C1 and a filter capacitor C3, wherein the filter capacitor C1 is a large-capacity electrolytic capacitor and converts the rectified direct current pulse signal into a linear direct current signal; the filter capacitor C3 is a small-capacity X7R capacitor and is responsible for filtering high-frequency interference signals; the rectified and filtered direct-current power supply is subjected to voltage division and stabilization through a voltage stabilizing diode D2, is subjected to voltage stabilization through a three-terminal voltage stabilizer U1, and is subjected to secondary filtering through a filter capacitor C2 and a filter capacitor C4, so that the safe and stable working voltage of the sensor chip H1 is provided.

When the S pole of the magnetic steel is close to the sensor, the sensor chip H1 outputs a current signal, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the triode T1 and the triode T2 form a signal power amplification and logic judgment circuit, the sensor signal is amplified to trigger the light-emitting diode at the input end of the optocoupler relay U2 to be lightened, the output end of the optocoupler relay U2 is conducted to enable the coil of the alternating current contactor to be electrified, the normally open contact of the alternating current contactor is closed, and the normally closed contact is opened.

When the magnetic steel leaves the sensor, the light emitting diode at the input end of the optocoupler relay U2 is turned off, the output end of the optocoupler relay U2 is disconnected, a coil of the alternating current contactor loses power, a normally open contact of the alternating current contactor is disconnected, and the normally closed contact is closed.

The sensor chip H1 can drive several tens mA, several hundreds mA, even 1000mA currents by outputting a few mA current, and the control between different voltages can be realized through the circuit. The circuit realizes the functions of supplying power by the alternating current power supply and controlling the alternating current load.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a control ac contactor's proximity switch, includes rectification filter module, its characterized in that: the input end of the rectifying and filtering module is connected with an alternating current power supply, the output end of the rectifying and filtering module is connected with the input end of a three-terminal regulator U1 through a voltage stabilizing diode D2, the output end of the three-terminal regulator U1 is connected with a power port of a sensor chip H1, and the signal output end of the sensor chip H1 is connected with the base electrode of a triode T1 through a resistor R1; an emitter electrode of the triode T1 is connected with a collector electrode of the triode T2 through a resistor R4, a collector electrode of the triode T1 is grounded through a resistor R3 and is connected with a base electrode of the triode T2 through a resistor R2, an emitter electrode of the triode T2 is connected with an input end of an optocoupler relay U2, and an output end of the optocoupler relay U2 is connected with a coil loop of the alternating current contactor; the transistor T1 is a PNP transistor, and the transistor T2 is an NPN transistor.

2. The proximity switch for controlling an ac contactor as recited in claim 1, wherein: the rectifying and filtering module comprises a rectifier D1, a pin 1 and a pin 3 of a rectifier D1 are connected with an alternating current power supply, a pin 4 of a rectifier D1 is grounded, a pin 2 of the rectifier D1 is connected with the cathode of a voltage stabilizing diode D2, and the anode of a voltage stabilizing diode D2 is connected with a pin 1 of a three-terminal regulator U1; the pin 2 of the rectifier D1 is grounded through a filter capacitor C1, and the filter capacitor C1 is an electrolytic capacitor with the capacity of 10 muF; the pin 2 of the rectifier D1 is also grounded through a filter capacitor C3, and the filter capacitor C3 is an X7R capacitor with the capacity of 0.1 muF.

3. The proximity switch for controlling an ac contactor as recited in claim 2, wherein: the pin 3 of the three-terminal voltage regulator U1 is grounded through a filter capacitor C2, and the filter capacitor C2 is an electrolytic capacitor with the capacity of 10 muF; the pin 3 of the three-terminal voltage regulator U1 is also grounded through a filter capacitor C4, and the filter capacitor C4 is an X7R capacitor with the capacity of 0.1 muF.

4. The proximity switch for controlling an ac contactor as recited in claim 1, wherein: the model of the three-terminal voltage regulator U1 is P6KE12CA7812, and the model of the optocoupler relay U2 is AQH 3213.

5. The proximity switch for controlling an ac contactor as recited in claim 1, wherein: the resistance of the resistor R1 is 5.1k omega, the resistance of the resistor R2 is 5.1k omega, the resistance of the resistor R3 is 10k omega, and the resistance of the resistor R4 is 10k omega.

6. The proximity switch for controlling an ac contactor as recited in claim 1, wherein: the voltage of the alternating current power supply is 24V.

7. The proximity switch for controlling an ac contactor as recited in claim 1, wherein: the sensor is a hall sensor of the HAL132 type.