JP3192729U - AC power detector - Google Patents

Abstract

An AC power supply detector is provided.
An AC power detector includes an outer casing, a solenoid, a rectifying filter circuit, and an expansion drive circuit. The outer casing includes a perforation, a first output end 530a, and a second output end 530b. The perforation passes an electric wire loaded with an AC power source through it. The solenoid 561 is located inside the outer casing and surrounds the perforation, senses the magnetic field generated by the AC power supply on the electric wire, and generates a first voltage. The rectifying filter circuit 580 rectifies and filters the first voltage to generate a second voltage. The expansion drive circuit 590 expands the second voltage and generates an output current between the first output terminal 530a and the second output terminal 530b.
[Selection] Figure 5

Description

  The present invention relates to an AC power source and to an AC power source detector.

An alternating current power supply (Alternating Current, AC) is a current that causes a periodic change in both magnitude and direction, and the operation average value within one period is zero.
Compared to a DC power source whose direction does not change with time, an AC power source is a relatively efficient method for transmitting electrical energy.
For this reason, all commercial and consumer power supplies in each country currently use an AC power supply system.

Most electrical installations supply electrical energy from an AC power source.
If the AC power supply is not properly supplied, the electrical equipment will not operate normally, resulting in a significant loss in the process of industrial production.
Therefore, the detection of whether or not the AC power supply is normally supplied is an important issue that needs to be resolved.

FIG. 8 is a block chart of the voltage detector 800 disclosed in Patent Document 1. In FIG.
The voltage detector 800 receives the waveform signal of the external AC power supply, and compares the amplitude value of the waveform signal of the external AC power supply with the amplitude value of the waveform signal of the backup AC power supply.
If the external AC power supply and the backup AC power supply have the same point amplitude value and the external AC power supply waveform amplitude value is smaller than the backup AC power supply waveform amplitude value, the voltage of the external AC power supply drops and the backup AC power supply It is lower than the voltage rate value of the power supply.

At this time, the control unit immediately switches the equipment from a state communicating with the external AC power source to a state communicating with the backup AC power source.
As a result, the rapid decrease in the voltage of the external AC power supply causes the equipment equipment to freeze, which eliminates the possibility of the operation stoppage and maintains the equipment equipment in normal operation.

However, most current AC power detectors must be connected to the AC power source itself.
Even in Patent Document 1 shown in FIG. 8, the voltage detector 800 cannot detect and compare whether or not the voltage of the external AC power supply has decreased unless it is connected to the external AC power supply.
Connecting an AC power source detector to an AC power source is the same as increasing the load on the AC power source, and consumes excess power.

Taiwan Patent Notice No. M450732 Specification

  However, the above-described device has drawbacks in use and needs to be improved. The cause is as follows.

Currently, most AC power detectors must be connected to the AC power supply itself.
Even in Patent Document 1 described above, if the voltage detector is not connected to an external AC power supply, it cannot be detected and compared whether or not the voltage of the external AC power supply has dropped.
Connecting an AC power source detector to an AC power source is the same as increasing the load on the AC power source, and consumes excess power.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an AC power supply detector.

The AC power detector provided by the present invention includes an outer casing, a solenoid, a rectifying filter circuit, and an expansion drive circuit.
The outer casing is provided with a centrally located perforation through which the electric wire carrying the AC power supply is passed.
The solenoid is located inside the outer casing and surrounds the perforation, senses the magnetic field generated by the AC power supply on the wire, and generates a first voltage.
The rectifying filter circuit is located inside the outer casing and rectifies and filters the first voltage to generate a second voltage.
The expansion drive circuit is located inside the outer casing, expands the second voltage, and generates an output current between the first output terminal and the two output terminals.

The AC power detector provided by the present invention includes a magnetic field sensing circuit, a rectifying filter circuit, and an expansion driving circuit.
The magnetic field sensing circuit senses a magnetic field in a specific area, and generates a first voltage at the first node based on the strength of the magnetic field. Among them, a conductive wire having an AC power source generates a magnetic field in the specific area.
The rectifying filter circuit is connected between the first node and the second node, rectifies and filters the first voltage, thereby generating a second voltage at the second node.
The expansion drive circuit is connected to the second node, expands the second voltage, and generates an output current between the first output terminal and the two output terminals.

The AC power detector of the present invention has the following effects.
Since it directly senses the magnetic field generated by the AC power supply, it is not invasive, so it can be additionally installed in various existing facilities without having to remove or destroy the existing facilities.

  Furthermore, since the AC power detector of the present invention uses the electric power generated by magnetic field sensing and turns on the indicator, no separate power source is required.

  In addition, since the AC power detector of the present invention converts the sensed AC signal into a digitized ON / OFF electronic signal, it can perform long-distance detection without interference.

  Finally, the multiple AC power detectors of the present invention can be connected in series with each other to save the input contacts of the programmable logic circuit.

1 is a schematic front view of an AC power detector according to an embodiment of the present invention. It is a three-dimensional schematic diagram of an AC power detector according to an embodiment of the present invention. 1 is a schematic diagram showing a magnetic field generated by an AC power source passing through a perforation in the center of an AC power source detector according to an embodiment of the present invention. 1 is a schematic diagram illustrating an AC power source detector and a conductive wire with an AC power source according to an embodiment of the present invention. It is a schematic diagram which shows the correspondence of the output voltage of the alternating current power supply detector by one Embodiment of this invention, and the current root mean square of alternating current power supply. 1 is a block chart of an AC power detector according to an embodiment of the present invention. It is a schematic diagram showing the connection of an AC power detector and a programmable logic circuit according to an embodiment of the present invention. It is a schematic diagram which shows the connection of the alternating current power supply detector and programmable logic circuit by another kind of embodiment of this invention. 1 is a schematic diagram illustrating a connection of a number of AC power detectors and a programmable logic circuit according to an embodiment of the present invention. 3 is a block diagram of a voltage detector according to Patent Document 1.

(One embodiment)
An AC power detector according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic front view of an AC power detector 100 according to the present invention.
A perforation 110 is provided in the center of the front surface of the AC power supply detector 100. An electric wire can be passed through the perforation 110, and an AC power source is loaded on the electric wire.

An indicator 120 is provided in front of the AC power source detector 100.
The AC power source detector 100 displays whether or not the amplitude of the AC power source loaded on the electric wire has reached a normal level by the indicator 120.
If the amplitude of the AC power source has reached a normal level, the indicator 120 is lit.
On the contrary, if the AC power is not loaded on the electric wire or the amplitude of the AC power does not reach the normal level, the indicator 120 does not light up.
Therefore, the user can know whether or not the amplitude of the AC power source loaded on the electric wire has reached a normal level based on the blinking state of the indicator 120.

A pin unit 130 is provided in front of the AC power source detector 100.
In one embodiment, the pin unit 130 includes four pins 130a, 130b, 130c, and 130d.
Pins 130a and 130b are two output ends of the AC power detector 100, that is, the AC power detector 100 generates an output current between the pins 130a and 130b.

If the AC power source loaded on the electric wire is at a normal level, the output current generated between the pins 130a and 130b by the AC power source detector 100 is equal to the first level.
If the AC power is not loaded on the wire or if the AC power loaded on the wire is lower than the normal level, the output current generated by the AC power detector 100 between the pins 130a and 130b is equal to the second level. .
Therefore, the user can know whether or not the amplitude of the AC power source loaded on the electric wire has reached a normal level based on the magnitude of the output current generated by the AC power source detector 100.

In one embodiment, the pin unit 130 further includes pins 130c and 130d.
Pin 130c connects to 130d and is used when AC power detector 100 and a number of other AC power detectors are connected in series with each other.
The method of serial connection between the AC power source detector 100 and many other AC power source detectors will be further described with reference to FIG.

FIG. 2A is a three-dimensional schematic diagram of the AC power detector of the present invention.
The wire passes through the perforation just in the center of the AC power detector.
The wires are not connected to the AC power detector.
Thus, the AC power detector does not become a load of AC power on the wire and therefore does not increase power consumption.
An AC power source Ip is carried on the electric wire.
If the AC power source Ip on the electric wire changes its amplitude with time, a magnetic field is generated around the electric wire, and the magnetic field strength changes according to the amplitude of the AC power source Ip (see FIG. 2B).
Therefore, the AC power detector detects the blinking state of the indicator and the level of the output current by sensing the magnetic field around the central bore.

FIG. 3 is a schematic diagram of an AC power detector 300 and a conducting wire 350 having an AC power source.
A perforation 310 is provided at the center of the AC power supply detector 300.
The conducting wire 350 has an AC power source Ip and passes through the perforation 310.
At the same time, the AC power detector 300 includes output ends 330a and 330b.
When the AC power source detector 300 senses a magnetic field generated by the AC power source Ip around the perforation 310, an output current is generated between the output ends 330a and 330b.

In one embodiment, the load electrical resistance at the output end is 2 KΩ.
The current flowing through the output ends 330a and 330b is Ic.
The level of the output current Ic is [24V-0.8V] / 2KΩ.

FIG. 4 is a schematic diagram showing a correspondence relationship between the output voltage Vce of the AC power supply detector and the current root mean square Ip of the AC power supply.
The output voltage Vce of the AC power detector has two levels.
The first level is 0.8V and the second level is 24V.
When the current root mean square Ip of the AC power source increases from 0 A to 1 A, the output voltage Vce of the AC power source detector decreases from the second level 24 V to the first level 0.8 V during the time TPHL.

When the current root mean square Ip of the AC power supply decreases from 1A to 0A, the output voltage Vce of the AC power supply detector rises from the first level 0.8V to the 75% level of the second level 24V during the time TPLH. To do.
Therefore, the user can determine whether or not the AC power supply Ip is at a normal level based on the level of the output voltage Vce.

FIG. 5 is a block chart of the AC power detector 500 of the present invention.
In one embodiment, the AC power detector 500 includes a magnetic field sensing circuit 560, an indicator 570, a rectifying filter circuit 580, and an expansion drive circuit 590.
The magnetic field sensing circuit 560 senses the magnetic field in the area around the central perforation of the outer periphery of the AC power detector 500 and generates a first voltage at the first node 551 based on the strength of the magnetic field.

In one embodiment, the magnetic field sensing circuit 560 includes a solenoid 561 and senses the magnetic field generated by the peripheral area of the central perforation of the conductor loading the AC power source.
The indicator 570 is connected between the first node 551 and the ground, and lights up based on the intensity of the first voltage.
In one embodiment, the indicator 570 includes an electrical resistance 572 and an LED indicator 571.
The rectifying filter circuit 580 is connected between the first node 551 and the second node 552 and rectifies and filters the first voltage, thereby generating a second voltage at the second node 552.

In one embodiment, the rectifying filter circuit 580 includes a diode 581 and a capacitor 582.
The diode 581 is connected between the first node 551 and the second node 552, and rectifies the current flowing between the first node 551 and the second node 552.
Capacitor 582 is connected between second node 552 and ground.
The expansion drive circuit 590 is connected to the second node 552, expands the second voltage, and generates an output current between the first output terminal 530a and the second output terminal 530b.

In one embodiment, the enlarged drive circuit 590 includes two transistors 591 and 592 and an electric resistance 593.
The electric resistance 593 is connected between the base of the transistor 591 and the second node 552.
The transistor 591 includes a collector and is connected to the first output terminal 530a.
Transistor 592 has a base and is connected to the emitter of transistor 591, the collector is connected to first output end 530a, and the emitter is connected to second output end 530b.

FIG. 6A is a schematic diagram of an embodiment showing the connection of the AC power detector 600 and the programmable logic circuit 640 of the present invention.
The first output terminal 630 a of the AC power supply detector 600 is connected to the NPN I / P endpoint of the programmable logic circuit 640.
The second output terminal 630 b of the AC power supply detector 600 is connected to the 0 V end point of the programmable logic circuit 640.

FIG. 6B is a schematic diagram of another embodiment showing the connection of the AC power detector 650 and the programmable logic circuit 690 of the present invention.
The first output terminal 680 a of the AC power detector 650 is connected to the 24 V endpoint of the programmable logic circuit 690.
The second output terminal 680 b of the AC power detector 650 is connected to the PNP I / P endpoint of the programmable logic circuit 650.

FIG. 7 is a schematic diagram of an embodiment showing the connection of multiple AC power detectors 710, 720,..., 7n0 and the programmable logic circuit 700 of the present invention.
When a large number of AC power detectors are connected in series, all the AC power detectors located in the middle stage are identical except for the first and last AC power detectors.

Take AC power detector 720 as an example.
The second pin 720b of the AC power detector 720 is connected to the first pin 710a of the front AC power detector 710, and the fourth pin 720d of the AC power detector 720 is connected to the third pin 710c of the front AC power detector 710. To do.
The first pin 720a of the AC power detector 720 is connected to the second pin 730b of the rear AC power detector 730, and the third pin 720c of the AC power detector 720 is connected to the fourth pin 730d of the rear AC power detector 730. To do.

The first pin 7n0A of the AC power detector 7n0 at the end is connected to the third pin 7 (n-1) 0c of the front AC power detector 7 (n-1) 0, and the second pin 7n0b of the AC power detector 7n0. Is connected to the first pin 7 (n-1) 0a of the front AC power detector 7 (n-1) 0.
The first pin 710a of the frontmost AC power detector 710 is connected to the com end point of the front programmable logic circuit 700, and the fourth pin 710d of the AC power detector 710 is the NPN I / P end point of the programmable logic circuit 700. Connect to.

Thus, the output voltages of a large number of AC power detectors 710, 720,..., 7n0 are summed and connected across the both ends of the second pin 710b and the fourth pin 710d of the first AC power detector 710.
Therefore, the programmable logic circuit 700 is connected only to both ends of pins 710b and 710d of the first AC power detector 710, so that any one of the many AC power sources passing through the multiple AC power detectors 710, 720,. For example, it is possible to detect whether there is a power supply abnormality or a power outage.

The AC power detector of the present invention directly senses the magnetic field generated by the AC power source, so it is not invasive. Therefore, it is not necessary to remove or destroy the existing equipment. can do.
In addition, the AC power detector of the present invention uses electric power generated by magnetic field sensing and lights the indicator, so that no separate power source is required.
Furthermore, since the AC power detector of the present invention converts the detected AC signal into a digitized ON / OFF electronic signal, it can perform long-distance detection without interference.
Finally, the multiple AC power detectors of the present invention can be connected in series with each other to save the input contacts of the programmable logic circuit.

  By summing up the descriptions of the above embodiments, the operation, use, and effects of the present invention can be fully understood. However, the above-described embodiments are merely preferred embodiments of the present invention, and do not limit the scope of the claims for utility model registration of the present invention. That is, all simple changes and modifications having the same effect based on the scope of the claims of the utility model registration of the present invention and the contents of the description shall fall within the scope of the present invention.

100 AC power detector 120 Indicator 110 Perforation 130 Pin unit 130a, 130b, 130c, 130d Pin 300 AC power detector 350 Conductor 330a, 330b with AC power supply Pin 500 AC power detector 560 Magnetic field sensing circuit 561 Solenoid 570 Indicator 571 LED indicator 572 Electrical resistance 580 Rectifier filter circuit 581 Diode 582 Capacitor 590 Enlarged drive circuit 591, 592 Transistor 593 Electrical resistance 600, 650, 710, 720,..., 7n0 AC power detector 640, 690, 700 Programmable logic circuit

FIG. 6B is a schematic diagram of another embodiment showing the connection of the AC power detector 650 and the programmable logic circuit 690 of the present invention.
The first output terminal 680 a of the AC power detector 650 is connected to the 24 V endpoint of the programmable logic circuit 690.
The second output terminal 680 b of the AC power detector 650 is connected to the PNP I / P endpoint of the programmable logic circuit 690 .

Claims (10)

An AC power detector comprising a first output end and a second output end;
A solenoid (solenoid), rectifying filter circuit, and enlarged drive circuit are provided.
The solenoid senses a magnetic field in a specific area, generates a first voltage at a first node based on the strength of the magnetic field, and a conducting wire with an AC power source generates a magnetic field in the specific area;
The rectifying filter circuit is connected between a first node and a second node, rectifies and filters the first voltage, thereby generating a second voltage at the second node,
The expansion drive circuit is connected to a second node, expands a second voltage, and generates an output current between the first output terminal and the second output terminal,
AC power detector.   The AC power detector according to claim 1, further comprising an indicator, connected between the first node and ground, and lit based on the intensity of the first voltage.   The rectifying filter circuit includes a diode and a capacitor, the diode is connected between a first node and a second node, rectifies a current flowing between the first node and the second node, and the capacitor is 2. The AC power detector according to claim 1, wherein the AC power detector is connected between the second node and one ground.   The enlarged drive circuit includes a first transistor, an electric resistor, and a second transistor. The first transistor includes a collector and is connected to a first output terminal. The electric resistor includes a base of the first transistor and a second transistor. Connected between two nodes, the second transistor comprises a base, connected to the emitter of the first transistor, the collector connected to the output end, and the emitter connected to the second output end The AC power detector according to claim 1.   The AC power detector according to claim 1, wherein the AC power source detector inputs an output current to a programmable logic circuit (PLC) via the first output terminal and the second output terminal. Power detector.   The outer wall of the AC power detector further includes a first pin and a second pin, and the first pin is connected to the second pin, and the AC power detector, the previous AC power detector and the rear one are connected. When the AC power detector is connected in series, the first output end of the AC power detector is connected to the second output end of the rear AC power detector, and the second output end of the AC power detector is the front AC power source. Connect to the first output end of the detector, the first pin of the AC power detector is connected to the second pin of the back AC power detector, the second pin of the AC power detector is the first of the back AC power detector The AC power detector according to claim 1, wherein the AC power detector is connected to a pin. The AC power detector has an outer casing, a solenoid, a rectifying filter circuit, and an enlarged drive circuit.
The outer casing includes a perforation, and the perforation passes an electric wire that loads an AC power supply, and includes a first output end and a second output end.
The solenoid is located inside the outer casing, surrounds the periphery of the perforation, generates a first voltage by sensing a magnetic field generated by an AC power supply on the wire,
The rectifying filter circuit rectifies and filters the first voltage to generate a second voltage,
The expansion drive circuit expands a second voltage and generates an output current between the first output terminal and the second output terminal,
AC power detector.   The AC power detector according to claim 7, further comprising an indicator, connected to the solenoid, and lit based on the intensity of the first voltage.   The AC power detector according to claim 7, wherein the AC power source detector inputs an output current to a programmable logic circuit (PLC) through the first output terminal and the second output terminal. Power detector.   The outer casing further includes a first pin and a second pin, the first pin is connected to the second pin, and the AC power detector, the previous AC power detector, and the next AC power detector are connected to each other. When connected in series, the first output end of the AC power detector is connected to the second output end of the rear AC power detector, and the second output end of the AC power detector is connected to the first output of the previous AC power detector. The first pin of the AC power detector is connected to the second pin of the rear AC power detector, and the second pin of the AC power detector is connected to the first pin of the rear AC power detector. The AC power detector according to claim 7.

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