Abnormal power-off system alarm circuit

Abstract

The utility model relates to the technical field of safe power supply, in particular to an abnormal power-off system alarm circuit, which comprises an equipment switch J13, an abnormal power-off judgment module, a holding circuit and a buzzer module, and is characterized in that the buzzer module comprises a buzzer switch J8; a first pin of the equipment switch J13 is connected with the holding circuit, and the holding circuit is connected with a first pin of the buzzer switch J8; a third pin of the equipment switch J13 is connected with one end of the abnormal power failure judgment module, and the other end of the abnormal power failure judgment module is connected with a second pin of the buzzer switch J8. According to the utility model, power-off abnormity alarm can be completed only by using a large capacitor without additionally depending on a controller, and the controller can be completely powered off at the moment, so that the operating power after power off is greatly reduced, a built-in battery is not needed, and the risk is low; in addition, alarm during abnormal power failure and alarm during normal use can share one alarm system, the cost is low, and the size is small.

Description

Technical Field

[0001] The utility model relates to the technical field of safe power supply, in particular to an alarm circuit for an abnormal power failure system. Background Art

[0002] In the currently known field, a power outage alarm system generally connects a device to a monitored power line power source, and when the power is cut off (blackout), an alarm is sounded through a mobile phone card or a buzzer built into the power outage alarm.

[0003] For example, Chinese utility model patent publication number CN214202619U discloses a power outage alarm system and device, comprising an alarm module, a main communication module, a backup communication module, an energy storage module, and a central processing module. When a farm loses power, the central processing module outputs an alarm message to the alarm module, the main communication module, and the backup communication module. Upon receiving the alarm message from the central processing module via a public network, the main communication module outputs the alarm message to a backend server. Upon receiving the alarm message from the central processing module via a private network, the backup communication module outputs the alarm message to the backup communication modules of other power outage alarm devices. The backend server receives the alarm message from the main communication module and outputs it to the main communication modules of other power outage alarm devices. Power outage alarms primarily rely on the device's built-in battery, but this approach has the disadvantages of increased cost and the inherent chemical properties of the battery, which can introduce additional equipment risks such as explosion and fire.

[0004] Therefore, there is an urgent need for an abnormal power failure system alarm circuit with low cost and low risk. Utility Model Content

[0005] In order to overcome the problems existing in the prior art, the utility model aims to provide an abnormal power failure system alarm circuit.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an abnormal power failure system alarm circuit, comprising a device switch J13, an abnormal power failure judgment module, a maintenance circuit and a buzzer module, wherein the buzzer module comprises a buzzer switch J8;

[0007] The first pin of the device switch J13 is connected to the maintenance circuit, and the maintenance circuit is connected to the first pin of the buzzer switch J8; the third pin of the device switch J13 is connected to one end of the abnormal power-off judgment module, and the other end of the abnormal power-off judgment module is connected to the second pin of the buzzer switch J8.

[0008] The present invention is further configured as follows: a first pin of the device switch J13 is connected to one end of the capacitor C45, and the other end of the capacitor C45 is grounded.

[0009] The present utility model is further configured as follows: the holding circuit includes a field effect transistor Q3, a resistor R26, a diode D4, a diode D13 and a capacitor C43; the D pole of the field effect transistor Q3 is connected to the first pin of the device switch J13 and the first pin of the buzzer switch J8, the G pole of the field effect transistor Q3 is connected to a 12V power supply, and the G pole of the field effect transistor Q3 is grounded through a resistor R26; the S pole of the field effect transistor Q3 is connected to the cathode of the diode D13, the anode of the diode D13 is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to a 5V power supply; the anode of the capacitor C43 is connected between the diode D4 and the diode D13, and the cathode of the capacitor C43 is grounded.

[0010] The utility model is further configured as follows: the maintenance circuit also includes a resistor R27, a diode D5 and a capacitor C42; the first end of the resistor R27 is connected to the first pin of the buzzer switch J8, the second end of the resistor R27 is connected to the cathode of the diode D5, the anode of the diode D5 is connected to the 12V power supply, and the capacitor C42 is further connected between the diode D5 and the 12V power supply, and the capacitor C42 is grounded.

[0011] The present invention is further configured as follows: the buzzer module further includes a diode D6 and a capacitor C54; the positive electrode of the diode D6 is connected to the second pin of the buzzer switch J8, and the negative electrode of the diode D6 is connected to the first pin of the buzzer switch J8; one end of the capacitor C54 is connected to the first pin of the buzzer switch J8, and the other end is grounded.

[0012] The present invention is further configured as follows: the abnormal power-off judgment module includes a judgment circuit and a buzzer alarm circuit; the third pin of the device switch J13 is connected to the first end of the resistor R29, and the second end of the resistor R29 is respectively connected to the judgment circuit and the buzzer alarm circuit.

[0013] The utility model is further configured as follows: the judgment circuit includes a controller, a resistor R32, a resistor R31, a resistor R55, a field effect transistor Q5, and a capacitor C46; the first end of the resistor R32 is connected to the controller, the second end of the resistor R32 is connected to the resistor R31 and the G terminal of the field effect transistor Q5 respectively, and the resistor R31 is grounded; the G terminal of the field effect transistor Q5 is connected to the first end of the resistor R55, and the second end of the resistor R55 is grounded; the G terminal of the field effect transistor Q5 is also connected to the first end of the capacitor C46, ​​and the second end of C46 is grounded;

[0014] The D-pole of the field effect transistor Q5 is connected to the second end of the resistor R29 , and the S-pole of the field effect transistor Q5 is grounded.

[0015] The utility model is further configured as follows: the buzzer alarm circuit includes a resistor R30, a resistor R61 and a field effect transistor Q4; the first end of the resistor R30 is connected to the second end of the resistor R29, the second end of the resistor R30 is connected to the G pole of the field effect transistor Q4, and the G pole of the field effect transistor Q4 is grounded through the resistor R61; the D pole of the field effect transistor Q4 is connected to the second pin of the buzzer switch J8, and the S pole of the field effect transistor Q4 is grounded.

[0016] The utility model uses a large capacitor and multiple field effect transistors. When the machine is turned on and running normally, the power supply will charge the large capacitor. When the machine is turned on, multiple field effect transistors will form a logical short circuit, so that the buzzer will be powered and the buzzer will alarm. On the contrary, if the machine is turned off normally, the buzzer will have no power and will not cause an alarm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The utility model can complete the power failure abnormal alarm by using only a large capacitor, without relying on the controller. The controller can completely cut off the power at this time, greatly reducing the operating power after the power failure. There is no need to use a built-in battery, and the risk is low. Moreover, the alarm during abnormal power failure and the alarm during normal use can share a set of alarm systems, which is low in cost and small in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of the alarm circuit of the abnormal power-off system in an embodiment of the present utility model. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Example:

[0023] like Figure 1As shown, the present invention provides a preferred embodiment, an abnormal power failure system alarm circuit, including a device switch J13, an abnormal power failure judgment module, a maintenance circuit and a buzzer module, wherein the buzzer module includes a buzzer switch J8;

[0024] The first pin of the device switch J13 is connected to the holding circuit, which is connected to the first pin of the buzzer switch J8. The third pin of the device switch J13 is connected to one end of the abnormal power failure determination module, and the other end of the abnormal power failure determination module is connected to the second pin of the buzzer switch J8. The first pin of the device switch J13 is connected to one end of a capacitor C45, and the other end of the capacitor C45 is grounded.

[0025] The holding circuit includes a field-effect transistor Q3, a resistor R26, a diode D4, a diode D13, and a capacitor C43; the D electrode of the field-effect transistor Q3 is connected to the first pin of the device switch J13 and the first pin of the buzzer switch J8, the G electrode of the field-effect transistor Q3 is connected to a 12V power supply, and the G electrode of the field-effect transistor Q3 is grounded through a resistor R26; the S electrode of the field-effect transistor Q3 is connected to the cathode of the diode D13, the anode of the diode D13 is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to a 5V power supply; the anode of the capacitor C43 is connected between the diode D4 and the diode D13, and the cathode of the capacitor C43 is grounded.

[0026] The maintenance circuit also includes a resistor R27, a diode D5 and a capacitor C42; the first end of the resistor R27 is connected to the first pin of the buzzer switch J8, the second end of the resistor R27 is connected to the cathode of the diode D5, the anode of the diode D5 is connected to the 12V power supply, and the capacitor C42 is further connected between the diode D5 and the 12V power supply, and the capacitor C42 is grounded.

[0027] The buzzer module also includes a diode D6 and a capacitor C54; the anode of the diode D6 is connected to the second pin of the buzzer switch J8, and the cathode of the diode D6 is connected to the first pin of the buzzer switch J8; one end of the capacitor C54 is connected to the first pin of the buzzer switch J8, and the other end is grounded.

[0028] The abnormal power failure judgment module includes a judgment circuit and a buzzer alarm circuit; the third pin of the device switch J13 is connected to the first end of the resistor R29, and the second end of the resistor R29 is connected to the judgment circuit and the buzzer alarm circuit respectively.

[0029] The judgment circuit includes a controller, a resistor R32, a resistor R31, a resistor R55, a field effect transistor Q5, and a capacitor C46; the first end of the resistor R32 is connected to the controller, the second end of the resistor R32 is connected to the resistor R31 and the G terminal of the field effect transistor Q5 respectively, and the resistor R31 is grounded; the G terminal of the field effect transistor Q5 is connected to the first end of the resistor R55, and the second end of the resistor R55 is grounded; the G terminal of the field effect transistor Q5 is also connected to the first end of the capacitor C46, ​​and the second end of C46 is grounded;

[0030] The D-pole of the field effect transistor Q5 is connected to the second end of the resistor R29 , and the S-pole of the field effect transistor Q5 is grounded.

[0031] The buzzer alarm circuit includes a resistor R30, a resistor R61 and a field effect transistor Q4; the first end of the resistor R30 is connected to the second end of the resistor R29, the second end of the resistor R30 is connected to the G pole of the field effect transistor Q4, and the G pole of the field effect transistor Q4 is grounded through the resistor R61; the D pole of the field effect transistor Q4 is connected to the second pin of the buzzer switch J8, and the S pole of the field effect transistor Q4 is grounded.

[0032] like Figure 1 As shown, when the device is turned on, the device switch J13 is short-circuited. At this time, the capacitor C43 can be charged by VCC_5V;

[0033] After the device is turned on, the buzzer_control signal can be controlled by the controller. If the signal is high, the field effect tube Q5 is turned on, and the G pole of the field effect tube Q4 is low, the field effect tube Q4 cannot be turned on, and the buzzer cannot alarm.

[0034] If the signal is low, the field effect tube Q5 cannot be turned on, and the G pole of the field effect tube Q4 is high, the field effect tube Q4 can be turned on normally, and the other end of the buzzer is short-circuited to one end of the resistor R27, so the buzzer can normally prompt other problems.

[0035] After an abnormal power outage, the G terminal of FET Q5 defaults to a low level due to the presence of resistor R55, and FET Q5 is not conducting. The G terminal of FET Q3 is also low, and the S terminal of FET Q3 is high due to the presence of capacitor C43, because FET Q3 is conducting. At this time, because FET Q3 is conducting, the voltage on the G terminal of FET Q4 is also high through the short-circuited switch, so FET Q4 is turned on, the buzzer starts to sound, and the device starts to alarm. Conversely, after the switch is disconnected, that is, a normal shutdown, the G terminal of FET Q4 cannot be high and remains low, FET Q4 cannot conduct, and the buzzer does not alarm.

[0036] To sum up, the present invention uses a large capacitor C43 and multiple field effect transistors. When the power is turned on and running normally, the power supply will charge the large capacitor C43. When the power is on, multiple field effect transistors are used to form a logical short circuit, so that the buzzer is powered and the buzzer alarms. On the contrary, if the power is turned off normally, the buzzer has no power and no alarm will occur.

[0037] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

[0038] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Simple modifications or equivalent replacements of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. An abnormal power failure system alarm circuit, characterized in that: It includes a device switch J13, an abnormal power-off judgment module, a maintenance circuit and a buzzer module, wherein the buzzer module includes a buzzer switch J8; The first pin of the device switch J13 is connected to the maintenance circuit, and the maintenance circuit is connected to the first pin of the buzzer switch J8; the third pin of the device switch J13 is connected to one end of the abnormal power-off judgment module, and the other end of the abnormal power-off judgment module is connected to the second pin of the buzzer switch J8.

2. The abnormal power failure system alarm circuit according to claim 1, characterized in that: A first pin of the device switch J13 is connected to one end of the capacitor C45 , and the other end of the capacitor C45 is grounded.

3. The abnormal power failure system alarm circuit according to claim 2, characterized in that: The holding circuit includes a field-effect transistor Q3, a resistor R26, a diode D4, a diode D13, and a capacitor C43; the D electrode of the field-effect transistor Q3 is connected to the first pin of the device switch J13 and the first pin of the buzzer switch J8, the G electrode of the field-effect transistor Q3 is connected to a 12V power supply, and the G electrode of the field-effect transistor Q3 is grounded through a resistor R26; the S electrode of the field-effect transistor Q3 is connected to the cathode of the diode D13, the anode of the diode D13 is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to a 5V power supply; the anode of the capacitor C43 is connected between the diode D4 and the diode D13, and the cathode of the capacitor C43 is grounded.

4. The abnormal power failure system alarm circuit according to claim 3, characterized in that: The maintenance circuit also includes a resistor R27, a diode D5 and a capacitor C42; the first end of the resistor R27 is connected to the first pin of the buzzer switch J8, the second end of the resistor R27 is connected to the cathode of the diode D5, the anode of the diode D5 is connected to the 12V power supply, and the capacitor C42 is further connected between the diode D5 and the 12V power supply, and the capacitor C42 is grounded.

5. The abnormal power failure system alarm circuit according to claim 4, characterized in that: The buzzer module also includes a diode D6 and a capacitor C54; the anode of the diode D6 is connected to the second pin of the buzzer switch J8, and the cathode of the diode D6 is connected to the first pin of the buzzer switch J8; one end of the capacitor C54 is connected to the first pin of the buzzer switch J8, and the other end is grounded.

6. The abnormal power failure system alarm circuit according to claim 1, characterized in that: The abnormal power failure judgment module includes a judgment circuit and a buzzer alarm circuit; the third pin of the device switch J13 is connected to the first end of the resistor R29, and the second end of the resistor R29 is connected to the judgment circuit and the buzzer alarm circuit respectively.

7. The abnormal power failure system alarm circuit according to claim 6, characterized in that: The judgment circuit includes a controller, a resistor R32, a resistor R31, a resistor R55, a field effect transistor Q5, and a capacitor C46; the first end of the resistor R32 is connected to the controller, the second end of the resistor R32 is connected to the resistor R31 and the G terminal of the field effect transistor Q5 respectively, and the resistor R31 is grounded; the G terminal of the field effect transistor Q5 is connected to the first end of the resistor R55, and the second end of the resistor R55 is grounded; the G terminal of the field effect transistor Q5 is also connected to the first end of the capacitor C46, ​​and the second end of C46 is grounded; The D-pole of the field effect transistor Q5 is connected to the second end of the resistor R29 , and the S-pole of the field effect transistor Q5 is grounded.

8. The abnormal power failure system alarm circuit according to claim 6, characterized in that: The buzzer alarm circuit includes a resistor R30, a resistor R61 and a field effect transistor Q4; the first end of the resistor R30 is connected to the second end of the resistor R29, the second end of the resistor R30 is connected to the G pole of the field effect transistor Q4, and the G pole of the field effect transistor Q4 is grounded through the resistor R61; the D pole of the field effect transistor Q4 is connected to the second pin of the buzzer switch J8, and the S pole of the field effect transistor Q4 is grounded.

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