Fault detector for alternating current power supply of equipment

Abstract

According to the fault detector for the equipment AC power supply, an AC IN pin of a zero-crossing detector U1 is connected with a positive electrode of the equipment AC power supply through a resistor R3, and an AMP IN pin and a DC SUPPLY pin are connected with a negative electrode of the equipment AC power supply through an electrolytic capacitor C1. Two GND pins are connected with a pin 2 of the optical coupler U2 and also connected with the negative end of the electrolytic capacitor C1, and an OUT pin is connected with a pin 1 of the optical coupler U2 through a resistor R2; a pin 3 of the U2 is grounded, and a pin 4 of the U2 is connected with a pin A of the trigger U3 and is also connected with 5V through a resistor R1; a Y pin of the U3 is respectively connected with a B pin of a monostable multi-resonant oscillator U4, an ID of a trigger U5 and a # imgabs0 # pin; an electrolytic capacitor C2 is connected between two Cext pins of the U4, a Rint pin is connected to 5V, an A1 pin is grounded, a Qx pin is connected with a CLK pin of the U5, and a 1Q pin of the U5 is connected with an oscilloscope.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment AC power failure detection, in particular to a failure detector for equipment AC power supply. Background Art

[0002] With the continuous development of intelligent and automated technologies, modern electronic devices are increasingly reliant on AC power, placing higher demands on stable AC power. Therefore, monitoring and managing AC power has become particularly important. Currently, AC power fault detection suffers from a drawback: traditional technologies often require a long time to detect and identify the problem. This can lead to production interruptions or prolonged equipment downtime, significantly impacting power supply equipment. Utility Model Content

[0003] The utility model aims at solving the problems and deficiencies in the prior art and provides a novel fault detector for an AC power supply of an equipment.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] The utility model provides a fault detector for AC power supply of equipment, which is characterized in that it includes a zero-crossing detector U1, an optical coupler U2, a Schmitt trigger U3, a monostable multi-resonance oscillator U4 and a D-type trigger U5.

[0006] The AC IN pin of the zero-crossing detector U1 is connected as the input terminal to the positive electrode of the AC power supply of the device through the resistor R3, and the AMP IN pin and the DC SUPPLY pin are both connected to the negative electrode of the AC power supply of the device through the electrolytic capacitor C1. + The COMMON7 and COMMON8 pins of the zero-crossing detector U1 are electrically connected to the negative pole of the AC power supply, the two GND pins of the zero-crossing detector are electrically connected to pin 2 of the optocoupler U2 and the negative end of the electrolytic capacitor C1, and the OUT pin of the zero detector U1 is electrically connected to pin 1 of the optocoupler U2 through the resistor R2.

[0007] Pin 3 of the optical coupler U2 is grounded, and pin 4 of the optical coupler U2 is electrically connected to pin A of the Schmitt trigger U3 and is also connected to a power supply voltage +5V via a resistor R1.

[0008] The Y pin of the Schmitt trigger U3 is connected to the B pin of the monostable multi-resonance oscillator U4, the ID pin of the D-type trigger U5 and the Pins are electrically connected.

[0009] An electrolytic capacitor C2 is connected between the two Cext pins of the monostable multi-resonant oscillator U4, the Rint pin is connected to the power supply voltage +5V, the A1 pin is grounded, the Qx pin is electrically connected to the CLK pin of the D-type trigger U5, and the 1Q pin of the D-type trigger U5 is electrically connected to the oscilloscope as the output end.

[0010] The positive progress effect of this utility model is:

[0011] The utility model can quickly detect AC power failure of the equipment and send out an alarm signal in time to prompt the system to handle it. The response alarm time is less than 150us, thereby effectively reducing the loss and impact of the equipment caused by AC power failure and ensuring the security of the equipment and data.

[0012] The utility model utilizes rapid fault diagnosis technology, which can quickly discover faults and issue an alarm, making fault handling more efficient and accurate, thereby shortening the response time of fault handling and greatly improving the reliability and production efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. 1 is a circuit diagram of a fault detector for an AC power supply of an apparatus according to a preferred embodiment. DETAILED DESCRIPTION

[0014] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0015] like Figure 1 As shown, this embodiment provides a fault detector for an AC power supply of a device, which includes a zero-crossing detector U1, an optical coupler U2, a Schmitt trigger U3, a monostable multi-resonant oscillator U4 and a D-type trigger U5.

[0016] The zero-crossing detector U1 has the function of a zero-voltage switch. The AC IN pin (i.e., pin 5) of the zero-crossing detector U1 is connected to the positive electrode of the AC power supply of the device through the resistor R3 as the input terminal. The AMP IN pin (i.e., pin 13) and the DC SUPPLY pin (i.e., pin 2) are both connected to the negative electrode of the AC power supply of the device through the electrolytic capacitor C1. The AMP REF pin (i.e., pin 9) and DRIVER V +The DRIVER COM pin (i.e., pin 10) and the DRIVER COM pin (i.e., pin 11) are connected together, the two GND pins (i.e., pins 7 and 8) of the zero-crossing detector U1 are electrically connected to pin 2 of the optocoupler U2 and to the negative end of the electrolytic capacitor C1, and the OUT pin (i.e., pin 4) of the zero detector U1 is electrically connected to pin 1 of the optocoupler U2 through the resistor R2.

[0017] Pin 3 of the optocoupler U2 is grounded, and pin 4 of the optocoupler U2 is electrically connected to pin A of the Schmitt trigger U3 (ie, pin 1), and is also connected to a power supply voltage of +5V via a resistor R1.

[0018] The Y pin (i.e. pin 2) of the Schmitt trigger U3 is connected to the B pin (i.e. pin 5) of the monostable multi-resonant oscillator U4, the ID pin (i.e. pin 2) of the D-type trigger U5 and the The pin (ie, pin 6) is electrically connected.

[0019] An electrolytic capacitor C2 is connected between the two Cext pins (i.e., pin 10 and pin 11) of the monostable multi-resonant oscillator U4, the Rint pin (i.e., pin 9) is connected to the power supply voltage +5V, the A1 pin (i.e., pin 3) is grounded, the Qx pin (i.e., pin 1) is electrically connected to the CLK pin (i.e., pin 3) of the D-type trigger U5, and the 1Q pin (i.e., pin 5) of the D-type trigger U5 is electrically connected to the oscilloscope as the output end.

[0020] In this embodiment, the chip models used by each component are as follows: the zero-crossing detector U1 uses the CA3059 chip; the optocoupler U2 uses the TIL111 chip; the Schmitt trigger U3 uses the SN7414 chip; the monostable multi-resonant oscillator U4 uses the SN74121 chip; and the D-type trigger U5 uses the SN7474 chip.

[0021] The working process of the fault detector for AC power supply of equipment is as follows:

[0022] First, connect the fault detector's input to the equipment's AC power source and its output to the oscilloscope.

[0023] Then, make sure the AC power supply of the device is working properly and the oscilloscope is working normally.

[0024] Next, test the AC power supply of the equipment using a fault detector.

[0025] The working principle of this application is: when the AC power supply of the device is powered, the zero-crossing detector U1 outputs a zero-voltage pulse signal with a width of 100us, that is, a zero-crossing signal. The zero-voltage pulse signal is coupled by the optical coupler U2 and converted into the reverse pulse signal required by the digital circuit. The reverse pulse signal is inverted by the Schmitt trigger U3 and outputs a pulse signal with a pulse width of 100us. The 100us pulse signal output by the Schmitt trigger U3 triggers the monostable multi-resonant oscillator U4, so that the monostable multi-resonant oscillator U4 generates a pulse clock signal with a pulse width of 150us and sends it to the D-type trigger U5. The 100us pulse signal output by the Schmitt trigger U3 is simultaneously sent to the ID pin and the D-type trigger U5. The pin triggers D-type flip-flop U5 to output a pulse signal. This pulse signal serves as the input signal for an oscilloscope to monitor the device's AC power supply. At this point, the device's AC power supply is functioning properly, and the oscilloscope captures the pulse signal.

[0026] When the device's AC power supply is depleted, the AC voltage component is zero, and zero-crossing detector U1 outputs a step voltage. This step voltage can be interpreted as a persistently high signal. This high-level signal cannot trigger optocoupler U2, effectively rendering it inoperative. The output of optocoupler U2 remains high. The high-level output of optocoupler U2 is inverted by Schmitt trigger U3, which then outputs a low-level signal to monostable multivibrator U4. Monostable multivibrator U4 is triggered to generate a 150µs pulse clock signal, which is sent to D-type flip-flop U5. Simultaneously, Schmitt trigger U3 outputs a low-level signal to D-type flip-flop U5, causing it to be continuously reset. While D-type flip-flop U5 is reset, its output continuously outputs a low-level signal to the oscilloscope. This low-level signal can be captured by the oscilloscope. If the duration of this low-level signal exceeds 150µs, the device's AC power supply is detected, and a fault alarm is issued.

[0027] Based on the above working principle, it is possible to quickly detect whether the AC power supply of the device is faulty. When the signal captured by the oscilloscope is a pulse signal, it indicates that the AC power supply of the device is working normally. When the signal captured by the oscilloscope is a low-level signal exceeding 150us, it indicates that the AC power supply of the device is faulty, and a fault alarm is issued at this time.

[0028] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A fault detector for an AC power supply of an equipment, characterized in that: It includes a zero-crossing detector U1, an optocoupler U2, a Schmitt trigger U3, a monostable multi-resonant oscillator U4 and a D-type flip-flop U5; The AC IN pin of the zero-crossing detector U1 is connected as the input terminal to the positive electrode of the AC power supply of the device through the resistor R3, and the AMP IN pin and the DC SUPPLY pin are both connected to the negative electrode of the AC power supply of the device through the electrolytic capacitor C1. + The pin and the DRIVER COM pin are connected together, the two GND pins of the zero-crossing detector are electrically connected to pin 2 of the optocoupler U2 and the negative end of the electrolytic capacitor C1, and the OUT pin of the zero detector U1 is electrically connected to pin 1 of the optocoupler U2 through the resistor R2; Pin 3 of the optocoupler U2 is grounded, and pin 4 of the optocoupler U2 is electrically connected to pin A of the Schmitt trigger U3 and is also connected to a power supply voltage of +5V via a resistor R1; The Y pin of the Schmitt trigger U3 is connected to the B pin of the monostable multi-resonance oscillator U4, the ID pin of the D-type trigger U5 and the Pin electrical connection; An electrolytic capacitor C2 is connected between the two Cext pins of the monostable multi-resonant oscillator U4, the Rint pin is connected to the power supply voltage +5V, the A1 pin is grounded, the Qx pin is electrically connected to the CLK pin of the D-type trigger U5, and the 1Q pin of the D-type trigger U5 is electrically connected to the oscilloscope as the output end.

2. A fault detector for an AC power supply of a device as claimed in claim 1, characterized in that: The zero-crossing detector U1 adopts the CA3059 chip.

3. A fault detector for an AC power supply of a device as claimed in claim 1, characterized in that: The optical coupler U2 adopts the TIL111 chip.

4. A fault detector for an AC power supply of a device as claimed in claim 1, characterized in that: The Schmitt trigger U3 adopts the SN7414 chip.

5. A fault detector for an AC power supply of a device as claimed in claim 1, characterized in that: The monostable multi-resonance oscillator U4 adopts the SN74121 chip.

6. A fault detector for an AC power supply of a device as claimed in claim 1, characterized in that: The D-type flip-flop U5 adopts the SN7474 chip.

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