CN221767647U - A power failure alarm circuit powered by dual DC12V power supplies - Google Patents

Abstract

A power-off alarm circuit powered by dual DC12V power supplies effectively solves the problem that the existing dual power supply technical solution adopts the mode of directly connecting the output ends together, in which case the two power supplies will interfere with each other, resulting in reduced stability of the power supply of the two power supplies; it comprises a dual power supply module, an isolation module, a conversion module, an indication module and an alarm module, the dual power supply module comprises an IN1 power supply line and an IN2 power supply line, the isolation module comprises a first isolation module composed of D1\D2\D3\D4\D5\D6 diodes and a second isolation module composed of D7\D8\D9\D10\D11\D12 diodes; the utility model has a clever structure and is easy to use. Through the settings of the alarm module, the conversion module and the indication module, the alarm module monitors the two power supply lines at the same time. When any one of the lines fails, the buzzer arranged in the alarm module will sound an alarm to prompt the staff to perform maintenance. Under the premise of not affecting the alarm indication effect, the alarm circuit is more simple and the hardware cost is reduced.

Description

A power failure alarm circuit powered by dual DC12V power supplies

Technical Field

The utility model relates to the technical field of engineering control, in particular to a power failure alarm circuit powered by dual DC12V power supplies.

Background Art

Dual power supply means that buildings, equipment or systems use two or more power supply methods, which are automatically or manually switched under certain conditions to ensure the continuity and reliability of power supply and reduce the losses and risks caused by single power failure. It is an essential power backup protection technology for modern buildings, projects and equipment.

At present, the development of dual power supply technology has been relatively mature, but the existing dual power supply solution still has the following problems:

(1) The existing dual power supply technology solution is that the two power supplies have two power supply detection circuits respectively, and two buzzers are required for alarm. Not only is the circuit complicated, but the cost will also increase accordingly.

(2) The output ends of the existing two power supplies are directly connected together, and the two power supplies will interfere with each other, resulting in reduced stability of the power supply of the two power supplies.

Utility Model Content

In view of the above situation, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a power failure alarm circuit powered by a dual DC12V power supply, which effectively solves the problems mentioned in the background technology.

The technical solution is that the utility model includes a dual power supply module, an isolation module, a conversion module, an indication module and an alarm module, and the dual power supply module includes an IN1 power supply circuit and an IN2 power supply circuit;

The isolation module includes a first isolation module composed of D1\D2\D3\D4\D5\D6 diodes and a second isolation module composed of D7\D8\D9\D10\D11\D12 diodes;

The IN1 power supply circuit is connected to the first isolation module, and the IN2 power supply circuit is connected to the second isolation module;

The conversion module includes a linear voltage regulator chip L7805CV, which is used to convert the DC12V voltage into a DC5V voltage;

The indication module comprises a light emitting diode for correctly indicating the state of the output voltage;

The alarm module includes an IN1 power-off alarm circuit and an IN2 power-off alarm circuit, the IN1 power-off alarm circuit and the IN2 power-off alarm circuit are commonly connected to a buzzer, the IN1 power-off alarm circuit includes a first transistor, a second transistor and a first pull-up resistor, and the IN2 power-off alarm circuit includes a third transistor, a fourth transistor and a second pull-up resistor.

Preferably, the IN1 power-off alarm circuit and the IN2 power-off alarm circuit are both connected to the negative pole of the buzzer, and the positive pole of the buzzer is connected to a jumper device.

Preferably, the first pull-up resistor and the second pull-up resistor are connected to the base of the second transistor and the fourth transistor respectively.

Preferably, the diode in the isolation module is a Schottky barrier diode.

Preferably, the dual power supply module is connected to the indication module via an isolation module and a conversion module.

Compared with the prior art, the beneficial effects of the utility model are:

1. Through the settings of alarm module, conversion module and indication module, when any of the dual power supply lines loses power, the alarm module will issue an alarm prompt. Compared with the traditional dual power supply technology solution, it does not affect the alarm indication while also ensuring the power stability of the two power supplies at the same time.

2. Through the settings of alarm module, conversion module and indication module, the alarm module monitors two power supply lines at the same time. When any of the lines fails, the buzzer set in the alarm module will sound an alarm to prompt the staff to perform maintenance. Without affecting the alarm indication effect, the alarm circuit can be simpler and the hardware cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a dual power supply module in the present invention.

FIG. 2 is a schematic diagram of an alarm module in the present utility model.

FIG. 3 is a flow chart of the present utility model.

Explanation of the symbols in the schematic diagram:

1. Dual power supply module; 101. IN1 power supply circuit; 102. IN2 power supply circuit; 10. Isolation module; 11. First isolation module; 12. Second isolation module; 20. Conversion module; 30. Indication module; 31. Light emitting diode; 40. Alarm module; 41. IN1 power failure alarm circuit; 411. First transistor; 412. Second transistor; 413. First pull-up resistor; 42. IN2 power failure alarm circuit; 421. Third transistor; 422. Fourth transistor; 423. Second pull-up resistor; 50. Buzzer; 60. Jumper device.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

As shown in Figures 1 to 3, a dual power supply module 1, an isolation module 10, a conversion module 20, an indication module 30 and an alarm module 40 are included, and the dual power supply module 1 includes an IN1 power supply line 101 and an IN2 power supply line 102;

The isolation module 10 includes a first isolation module 11 composed of D1\D2\D3\D4\D5\D6 diodes and a second isolation module 12 composed of D7\D8\D9\D10\D11\D12 diodes. The diodes in the isolation module 10 are Schottky barrier diodes. The two input power supplies are isolated by the Schottky barrier diodes so that the states of the IN1 power supply line 101 and the IN2 power supply line 102 can be monitored respectively to ensure the output power of the IN1 power supply line 101 and the IN2 power supply line 102.

The IN1 power supply line 101 is connected to the first isolation module 11, and the IN2 power supply line 102 is connected to the second isolation module 12;

The conversion module 20 includes a linear voltage regulator chip L7805CV, which is used to convert the DC12V voltage into a DC5V voltage for the monitoring circuit and the buzzer to work;

The indication module 30 comprises a light emitting diode 31 for correctly indicating the state of the output voltage;

The alarm module 40 includes an IN1 power-off alarm circuit 41 and an IN2 power-off alarm circuit 42, and the IN1 power-off alarm circuit 41 and the IN2 power-off alarm circuit 42 are commonly connected to a buzzer 50, and the IN1 power-off alarm circuit 41 includes a first transistor 411, a second transistor 412 and a first pull-up resistor 413, and the IN2 power-off alarm circuit 42 includes a third transistor 421, a fourth transistor 422 and a second pull-up resistor 423. When any one of the IN1 power supply circuit 101 and the IN2 power supply circuit 102 loses power, the buzzer 50 can sound an alarm, and the buzzer 50 cancels the alarm after power is restored.

The IN1 power failure alarm circuit 41 and the IN2 power failure alarm circuit 42 are both connected to the negative pole of the buzzer 50. The positive pole of the buzzer 50 is connected to a jumper device 60. The jumper device 60 is a set of 2P JP1 jumper devices. The user can freely select the alarm function of the buzzer 50.

The first pull-up resistor 413 and the second pull-up resistor 423 are connected to the bases of the second transistor 412 and the fourth transistor 422 respectively.

The dual power supply module 1 is connected to the indication module 30 via the isolation module 10 and the conversion module 20 .

Referring to Figures 1 and 2, the specific working principle of the alarm circuit of the utility model is as follows:

(1) IN1 power supply line 101 is disconnected, and IN2 power supply line 102 is supplying power normally;

When the IN1 power supply line 101 is disconnected, the first transistor 411 is in a cut-off state. At this time, the base of the second transistor 412 is at a high level under the action of the first pull-up resistor 413, so the second transistor 412 is turned on.

Since the IN2 power supply circuit 102 supplies power normally, the third transistor 421 is in the on state, and the base of the fourth transistor 422 is at a low level, which is not enough to turn on the fourth transistor 422. At this time, the cathode of the buzzer 50 is at a low level, causing the buzzer 50 to work and emit an alarm sound.

(2) IN2 power supply line 102 is disconnected, and IN1 power supply line 101 is supplying power normally;

As can be seen from (1), the first transistor 411 is in the on state and the third transistor 421 is in the off state. At this time, the second transistor 412 is at a low level and the fourth transistor 422 is at a high level, which can also make the buzzer 50 work and emit an alarm sound.

(3) When both the IN1 power supply line 101 and the IN2 power supply line 102 are supplying power normally;

From (1), it can be seen that the second transistor 412 and the fourth transistor 422 are both in the cut-off state, so that the working voltage of the buzzer Q350 cannot form a working circuit, and the buzzer 50 does not alarm.

(4) When both the IN1 power supply line 101 and the IN2 power supply line 102 are disconnected;

An indication module 30 is provided at the end of the dual power supply module 1. When the IN1 power supply line 101 and the IN2 power supply line 102 are both disconnected, the light-emitting diode 31 is off. The staff can judge whether the IN1 power supply line 101 and the IN2 power supply line 102 are disconnected at the same time by the state of the light-emitting diode 31.

Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. The power failure warning circuit powered by the double DC12V power supply is characterized by comprising a double power supply module (1), an isolation module (10), a conversion module (20), an indication module (30) and a warning module (40), wherein the double power supply module (1) comprises an IN1 power supply circuit (101) and an IN2 power supply circuit (102);

The isolation module (10) comprises a first isolation module (11) formed by D1/D2/D3/D4/D5/D6 diodes and a second isolation module (12) formed by D7/D8/D9/D10/D11/D12 diodes;

The IN1 power supply line (101) is connected with the first isolation module (11), and the IN2 power supply line (102) is connected with the second isolation module (12);

The conversion module (20) comprises a linear voltage regulator chip L7805CV for converting a DC12V voltage to a DC5V voltage;

the indicating module (30) comprises a light emitting diode (31) for correctly indicating the state of the output voltage;

alarm module (40) contain IN1 power down warning circuit (41) and IN2 power down warning circuit (42), IN1 power down warning circuit (41) and IN2 power down warning circuit (42) are connected with bee calling organ (50) jointly, IN1 power down warning circuit (41) contain first triode (411), second triode (412) and first pull-up resistor (413), IN2 power down warning circuit (42) contain third triode (421), fourth triode (422) and second pull-up resistor (423).

2. The power-down warning circuit powered by the double-DC 12V power supply according to claim 1, wherein the IN1 power-down warning circuit (41) and the IN2 power-down warning circuit (42) are connected with the negative electrode of the buzzer (50), and the positive electrode of the buzzer (50) is connected with the jumper device (60).

3. The power down warning circuit powered by the dual DC12V power supply according to claim 1, wherein the first pull-up resistor (413) and the second pull-up resistor (423) are respectively connected to the bases of the second triode (412) and the fourth triode (422).

4. A dual DC12V power supply power down warning circuit according to claim 1, characterized in that the diode in the isolation module (10) is a schottky barrier diode.

5. The power failure warning circuit powered by the double DC12V power supply according to claim 1, wherein the double power supply module (1) is connected with the indication module (30) through the isolation module (10) and the conversion module (20).